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Annotation of src/sys/kern/uipc_socket.c, Revision 1.208

1.208   ! para        1: /*     $NetBSD: uipc_socket.c,v 1.207 2012/01/25 00:28:36 christos Exp $       */
1.64      thorpej     2:
                      3: /*-
1.188     ad          4:  * Copyright (c) 2002, 2007, 2008, 2009 The NetBSD Foundation, Inc.
1.64      thorpej     5:  * All rights reserved.
                      6:  *
                      7:  * This code is derived from software contributed to The NetBSD Foundation
1.188     ad          8:  * by Jason R. Thorpe of Wasabi Systems, Inc, and by Andrew Doran.
1.64      thorpej     9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     20:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     21:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     22:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     23:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     24:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     25:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     26:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     27:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     28:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     29:  * POSSIBILITY OF SUCH DAMAGE.
                     30:  */
1.16      cgd        31:
1.1       cgd        32: /*
1.159     ad         33:  * Copyright (c) 2004 The FreeBSD Foundation
                     34:  * Copyright (c) 2004 Robert Watson
1.15      mycroft    35:  * Copyright (c) 1982, 1986, 1988, 1990, 1993
                     36:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        37:  *
                     38:  * Redistribution and use in source and binary forms, with or without
                     39:  * modification, are permitted provided that the following conditions
                     40:  * are met:
                     41:  * 1. Redistributions of source code must retain the above copyright
                     42:  *    notice, this list of conditions and the following disclaimer.
                     43:  * 2. Redistributions in binary form must reproduce the above copyright
                     44:  *    notice, this list of conditions and the following disclaimer in the
                     45:  *    documentation and/or other materials provided with the distribution.
1.85      agc        46:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        47:  *    may be used to endorse or promote products derived from this software
                     48:  *    without specific prior written permission.
                     49:  *
                     50:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     51:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     52:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     53:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     54:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     55:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     56:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     57:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     58:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     59:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     60:  * SUCH DAMAGE.
                     61:  *
1.32      fvdl       62:  *     @(#)uipc_socket.c       8.6 (Berkeley) 5/2/95
1.1       cgd        63:  */
1.59      lukem      64:
                     65: #include <sys/cdefs.h>
1.208   ! para       66: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.207 2012/01/25 00:28:36 christos Exp $");
1.64      thorpej    67:
1.179     christos   68: #include "opt_compat_netbsd.h"
1.64      thorpej    69: #include "opt_sock_counters.h"
                     70: #include "opt_sosend_loan.h"
1.81      martin     71: #include "opt_mbuftrace.h"
1.84      ragge      72: #include "opt_somaxkva.h"
1.167     ad         73: #include "opt_multiprocessor.h"        /* XXX */
1.1       cgd        74:
1.9       mycroft    75: #include <sys/param.h>
                     76: #include <sys/systm.h>
                     77: #include <sys/proc.h>
                     78: #include <sys/file.h>
1.142     dyoung     79: #include <sys/filedesc.h>
1.173     plunky     80: #include <sys/kmem.h>
1.9       mycroft    81: #include <sys/mbuf.h>
                     82: #include <sys/domain.h>
                     83: #include <sys/kernel.h>
                     84: #include <sys/protosw.h>
                     85: #include <sys/socket.h>
                     86: #include <sys/socketvar.h>
1.21      christos   87: #include <sys/signalvar.h>
1.9       mycroft    88: #include <sys/resourcevar.h>
1.174     pooka      89: #include <sys/uidinfo.h>
1.72      jdolecek   90: #include <sys/event.h>
1.89      christos   91: #include <sys/poll.h>
1.118     elad       92: #include <sys/kauth.h>
1.136     ad         93: #include <sys/mutex.h>
                     94: #include <sys/condvar.h>
1.205     bouyer     95: #include <sys/kthread.h>
1.37      thorpej    96:
1.179     christos   97: #ifdef COMPAT_50
                     98: #include <compat/sys/time.h>
1.184     christos   99: #include <compat/sys/socket.h>
1.179     christos  100: #endif
                    101:
1.202     uebayasi  102: #include <uvm/uvm_extern.h>
                    103: #include <uvm/uvm_loan.h>
                    104: #include <uvm/uvm_page.h>
1.64      thorpej   105:
1.77      thorpej   106: MALLOC_DEFINE(M_SOOPTS, "soopts", "socket options");
                    107: MALLOC_DEFINE(M_SONAME, "soname", "socket name");
1.37      thorpej   108:
1.142     dyoung    109: extern const struct fileops socketops;
                    110:
1.54      lukem     111: extern int     somaxconn;                      /* patchable (XXX sysctl) */
                    112: int            somaxconn = SOMAXCONN;
1.160     ad        113: kmutex_t       *softnet_lock;
1.49      jonathan  114:
1.64      thorpej   115: #ifdef SOSEND_COUNTERS
                    116: #include <sys/device.h>
                    117:
1.113     thorpej   118: static struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   119:     NULL, "sosend", "loan big");
1.113     thorpej   120: static struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   121:     NULL, "sosend", "copy big");
1.113     thorpej   122: static struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   123:     NULL, "sosend", "copy small");
1.113     thorpej   124: static struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   125:     NULL, "sosend", "kva limit");
                    126:
                    127: #define        SOSEND_COUNTER_INCR(ev)         (ev)->ev_count++
                    128:
1.101     matt      129: EVCNT_ATTACH_STATIC(sosend_loan_big);
                    130: EVCNT_ATTACH_STATIC(sosend_copy_big);
                    131: EVCNT_ATTACH_STATIC(sosend_copy_small);
                    132: EVCNT_ATTACH_STATIC(sosend_kvalimit);
1.64      thorpej   133: #else
                    134:
                    135: #define        SOSEND_COUNTER_INCR(ev)         /* nothing */
                    136:
                    137: #endif /* SOSEND_COUNTERS */
                    138:
1.167     ad        139: #if defined(SOSEND_NO_LOAN) || defined(MULTIPROCESSOR)
1.121     yamt      140: int sock_loan_thresh = -1;
1.71      thorpej   141: #else
1.121     yamt      142: int sock_loan_thresh = 4096;
1.65      thorpej   143: #endif
1.64      thorpej   144:
1.136     ad        145: static kmutex_t so_pendfree_lock;
1.205     bouyer    146: static struct mbuf *so_pendfree = NULL;
1.64      thorpej   147:
1.84      ragge     148: #ifndef SOMAXKVA
                    149: #define        SOMAXKVA (16 * 1024 * 1024)
                    150: #endif
                    151: int somaxkva = SOMAXKVA;
1.113     thorpej   152: static int socurkva;
1.136     ad        153: static kcondvar_t socurkva_cv;
1.64      thorpej   154:
1.191     elad      155: static kauth_listener_t socket_listener;
                    156:
1.64      thorpej   157: #define        SOCK_LOAN_CHUNK         65536
                    158:
1.205     bouyer    159: static void sopendfree_thread(void *);
                    160: static kcondvar_t pendfree_thread_cv;
                    161: static lwp_t *sopendfree_lwp;
1.93      yamt      162:
1.178     pooka     163: static void sysctl_kern_somaxkva_setup(void);
                    164: static struct sysctllog *socket_sysctllog;
                    165:
1.113     thorpej   166: static vsize_t
1.129     yamt      167: sokvareserve(struct socket *so, vsize_t len)
1.80      yamt      168: {
1.98      christos  169:        int error;
1.80      yamt      170:
1.136     ad        171:        mutex_enter(&so_pendfree_lock);
1.80      yamt      172:        while (socurkva + len > somaxkva) {
                    173:                SOSEND_COUNTER_INCR(&sosend_kvalimit);
1.136     ad        174:                error = cv_wait_sig(&socurkva_cv, &so_pendfree_lock);
1.98      christos  175:                if (error) {
                    176:                        len = 0;
                    177:                        break;
                    178:                }
1.80      yamt      179:        }
1.93      yamt      180:        socurkva += len;
1.136     ad        181:        mutex_exit(&so_pendfree_lock);
1.98      christos  182:        return len;
1.95      yamt      183: }
                    184:
1.113     thorpej   185: static void
1.95      yamt      186: sokvaunreserve(vsize_t len)
                    187: {
                    188:
1.136     ad        189:        mutex_enter(&so_pendfree_lock);
1.95      yamt      190:        socurkva -= len;
1.136     ad        191:        cv_broadcast(&socurkva_cv);
                    192:        mutex_exit(&so_pendfree_lock);
1.95      yamt      193: }
                    194:
                    195: /*
                    196:  * sokvaalloc: allocate kva for loan.
                    197:  */
                    198:
                    199: vaddr_t
                    200: sokvaalloc(vsize_t len, struct socket *so)
                    201: {
                    202:        vaddr_t lva;
                    203:
                    204:        /*
                    205:         * reserve kva.
                    206:         */
                    207:
1.98      christos  208:        if (sokvareserve(so, len) == 0)
                    209:                return 0;
1.93      yamt      210:
                    211:        /*
                    212:         * allocate kva.
                    213:         */
1.80      yamt      214:
1.109     yamt      215:        lva = uvm_km_alloc(kernel_map, len, 0, UVM_KMF_VAONLY | UVM_KMF_WAITVA);
1.95      yamt      216:        if (lva == 0) {
                    217:                sokvaunreserve(len);
1.80      yamt      218:                return (0);
1.95      yamt      219:        }
1.80      yamt      220:
                    221:        return lva;
                    222: }
                    223:
1.93      yamt      224: /*
                    225:  * sokvafree: free kva for loan.
                    226:  */
                    227:
1.80      yamt      228: void
                    229: sokvafree(vaddr_t sva, vsize_t len)
                    230: {
1.93      yamt      231:
                    232:        /*
                    233:         * free kva.
                    234:         */
1.80      yamt      235:
1.109     yamt      236:        uvm_km_free(kernel_map, sva, len, UVM_KMF_VAONLY);
1.93      yamt      237:
                    238:        /*
                    239:         * unreserve kva.
                    240:         */
                    241:
1.95      yamt      242:        sokvaunreserve(len);
1.80      yamt      243: }
                    244:
1.64      thorpej   245: static void
1.134     christos  246: sodoloanfree(struct vm_page **pgs, void *buf, size_t size)
1.64      thorpej   247: {
1.156     yamt      248:        vaddr_t sva, eva;
1.64      thorpej   249:        vsize_t len;
1.156     yamt      250:        int npgs;
                    251:
                    252:        KASSERT(pgs != NULL);
1.64      thorpej   253:
                    254:        eva = round_page((vaddr_t) buf + size);
                    255:        sva = trunc_page((vaddr_t) buf);
                    256:        len = eva - sva;
                    257:        npgs = len >> PAGE_SHIFT;
                    258:
                    259:        pmap_kremove(sva, len);
                    260:        pmap_update(pmap_kernel());
                    261:        uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE);
1.80      yamt      262:        sokvafree(sva, len);
1.64      thorpej   263: }
                    264:
1.93      yamt      265: /*
1.205     bouyer    266:  * sopendfree_thread: free mbufs on "pendfree" list.
1.136     ad        267:  * unlock and relock so_pendfree_lock when freeing mbufs.
1.93      yamt      268:  */
                    269:
1.205     bouyer    270: static void
                    271: sopendfree_thread(void *v)
1.93      yamt      272: {
1.137     ad        273:        struct mbuf *m, *next;
1.205     bouyer    274:        size_t rv;
1.93      yamt      275:
1.205     bouyer    276:        mutex_enter(&so_pendfree_lock);
1.64      thorpej   277:
1.205     bouyer    278:        for (;;) {
                    279:                rv = 0;
                    280:                while (so_pendfree != NULL) {
                    281:                        m = so_pendfree;
                    282:                        so_pendfree = NULL;
                    283:                        mutex_exit(&so_pendfree_lock);
                    284:
                    285:                        for (; m != NULL; m = next) {
                    286:                                next = m->m_next;
                    287:                                KASSERT((~m->m_flags & (M_EXT|M_EXT_PAGES)) == 0);
                    288:                                KASSERT(m->m_ext.ext_refcnt == 0);
                    289:
                    290:                                rv += m->m_ext.ext_size;
                    291:                                sodoloanfree(m->m_ext.ext_pgs, m->m_ext.ext_buf,
                    292:                                    m->m_ext.ext_size);
                    293:                                pool_cache_put(mb_cache, m);
                    294:                        }
1.93      yamt      295:
1.205     bouyer    296:                        mutex_enter(&so_pendfree_lock);
1.93      yamt      297:                }
1.205     bouyer    298:                if (rv)
                    299:                        cv_broadcast(&socurkva_cv);
                    300:                cv_wait(&pendfree_thread_cv, &so_pendfree_lock);
1.64      thorpej   301:        }
1.205     bouyer    302:        panic("sopendfree_thread");
                    303:        /* NOTREACHED */
1.64      thorpej   304: }
                    305:
1.80      yamt      306: void
1.134     christos  307: soloanfree(struct mbuf *m, void *buf, size_t size, void *arg)
1.64      thorpej   308: {
                    309:
1.156     yamt      310:        KASSERT(m != NULL);
1.64      thorpej   311:
1.93      yamt      312:        /*
                    313:         * postpone freeing mbuf.
                    314:         *
                    315:         * we can't do it in interrupt context
                    316:         * because we need to put kva back to kernel_map.
                    317:         */
                    318:
1.136     ad        319:        mutex_enter(&so_pendfree_lock);
1.92      yamt      320:        m->m_next = so_pendfree;
                    321:        so_pendfree = m;
1.205     bouyer    322:        cv_signal(&pendfree_thread_cv);
1.136     ad        323:        mutex_exit(&so_pendfree_lock);
1.64      thorpej   324: }
                    325:
                    326: static long
                    327: sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space)
                    328: {
                    329:        struct iovec *iov = uio->uio_iov;
                    330:        vaddr_t sva, eva;
                    331:        vsize_t len;
1.156     yamt      332:        vaddr_t lva;
                    333:        int npgs, error;
                    334:        vaddr_t va;
                    335:        int i;
1.64      thorpej   336:
1.116     yamt      337:        if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace))
1.64      thorpej   338:                return (0);
                    339:
                    340:        if (iov->iov_len < (size_t) space)
                    341:                space = iov->iov_len;
                    342:        if (space > SOCK_LOAN_CHUNK)
                    343:                space = SOCK_LOAN_CHUNK;
                    344:
                    345:        eva = round_page((vaddr_t) iov->iov_base + space);
                    346:        sva = trunc_page((vaddr_t) iov->iov_base);
                    347:        len = eva - sva;
                    348:        npgs = len >> PAGE_SHIFT;
                    349:
1.79      thorpej   350:        KASSERT(npgs <= M_EXT_MAXPAGES);
                    351:
1.80      yamt      352:        lva = sokvaalloc(len, so);
1.64      thorpej   353:        if (lva == 0)
1.80      yamt      354:                return 0;
1.64      thorpej   355:
1.116     yamt      356:        error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len,
1.79      thorpej   357:            m->m_ext.ext_pgs, UVM_LOAN_TOPAGE);
1.64      thorpej   358:        if (error) {
1.80      yamt      359:                sokvafree(lva, len);
1.64      thorpej   360:                return (0);
                    361:        }
                    362:
                    363:        for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE)
1.79      thorpej   364:                pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]),
1.194     cegger    365:                    VM_PROT_READ, 0);
1.64      thorpej   366:        pmap_update(pmap_kernel());
                    367:
                    368:        lva += (vaddr_t) iov->iov_base & PAGE_MASK;
                    369:
1.134     christos  370:        MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so);
1.79      thorpej   371:        m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP;
1.64      thorpej   372:
                    373:        uio->uio_resid -= space;
                    374:        /* uio_offset not updated, not set/used for write(2) */
1.134     christos  375:        uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space;
1.64      thorpej   376:        uio->uio_iov->iov_len -= space;
                    377:        if (uio->uio_iov->iov_len == 0) {
                    378:                uio->uio_iov++;
                    379:                uio->uio_iovcnt--;
                    380:        }
                    381:
                    382:        return (space);
                    383: }
                    384:
1.142     dyoung    385: struct mbuf *
1.147     dyoung    386: getsombuf(struct socket *so, int type)
1.142     dyoung    387: {
                    388:        struct mbuf *m;
                    389:
1.147     dyoung    390:        m = m_get(M_WAIT, type);
1.142     dyoung    391:        MCLAIM(m, so->so_mowner);
                    392:        return m;
                    393: }
                    394:
1.191     elad      395: static int
                    396: socket_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
                    397:     void *arg0, void *arg1, void *arg2, void *arg3)
                    398: {
                    399:        int result;
                    400:        enum kauth_network_req req;
                    401:
                    402:        result = KAUTH_RESULT_DEFER;
                    403:        req = (enum kauth_network_req)arg0;
                    404:
1.193     elad      405:        if ((action != KAUTH_NETWORK_SOCKET) &&
                    406:            (action != KAUTH_NETWORK_BIND))
1.191     elad      407:                return result;
                    408:
                    409:        switch (req) {
1.193     elad      410:        case KAUTH_REQ_NETWORK_BIND_PORT:
                    411:                result = KAUTH_RESULT_ALLOW;
                    412:                break;
                    413:
1.191     elad      414:        case KAUTH_REQ_NETWORK_SOCKET_DROP: {
                    415:                /* Normal users can only drop their own connections. */
                    416:                struct socket *so = (struct socket *)arg1;
                    417:
1.199     elad      418:                if (proc_uidmatch(cred, so->so_cred))
1.191     elad      419:                        result = KAUTH_RESULT_ALLOW;
                    420:
                    421:                break;
                    422:                }
                    423:
                    424:        case KAUTH_REQ_NETWORK_SOCKET_OPEN:
                    425:                /* We allow "raw" routing/bluetooth sockets to anyone. */
1.203     matt      426:                if ((u_long)arg1 == PF_ROUTE || (u_long)arg1 == PF_OROUTE
                    427:                    || (u_long)arg1 == PF_BLUETOOTH) {
1.191     elad      428:                        result = KAUTH_RESULT_ALLOW;
1.203     matt      429:                } else {
1.191     elad      430:                        /* Privileged, let secmodel handle this. */
                    431:                        if ((u_long)arg2 == SOCK_RAW)
                    432:                                break;
                    433:                }
                    434:
                    435:                result = KAUTH_RESULT_ALLOW;
                    436:
                    437:                break;
                    438:
1.192     elad      439:        case KAUTH_REQ_NETWORK_SOCKET_CANSEE:
                    440:                result = KAUTH_RESULT_ALLOW;
                    441:
                    442:                break;
                    443:
1.191     elad      444:        default:
                    445:                break;
                    446:        }
                    447:
                    448:        return result;
                    449: }
                    450:
1.119     yamt      451: void
                    452: soinit(void)
                    453: {
                    454:
1.178     pooka     455:        sysctl_kern_somaxkva_setup();
                    456:
1.148     ad        457:        mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM);
1.160     ad        458:        softnet_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
1.136     ad        459:        cv_init(&socurkva_cv, "sokva");
1.205     bouyer    460:        cv_init(&pendfree_thread_cv, "sopendfr");
1.166     ad        461:        soinit2();
1.136     ad        462:
1.119     yamt      463:        /* Set the initial adjusted socket buffer size. */
                    464:        if (sb_max_set(sb_max))
                    465:                panic("bad initial sb_max value: %lu", sb_max);
                    466:
1.191     elad      467:        socket_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
                    468:            socket_listener_cb, NULL);
1.119     yamt      469: }
                    470:
1.205     bouyer    471: void
                    472: soinit1(void)
                    473: {
                    474:        int error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL,
                    475:            sopendfree_thread, NULL, &sopendfree_lwp, "sopendfree");
                    476:        if (error)
                    477:                panic("soinit1 %d", error);
                    478: }
                    479:
1.1       cgd       480: /*
                    481:  * Socket operation routines.
                    482:  * These routines are called by the routines in
                    483:  * sys_socket.c or from a system process, and
                    484:  * implement the semantics of socket operations by
                    485:  * switching out to the protocol specific routines.
                    486:  */
                    487: /*ARGSUSED*/
1.3       andrew    488: int
1.160     ad        489: socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l,
                    490:         struct socket *lockso)
1.1       cgd       491: {
1.99      matt      492:        const struct protosw    *prp;
1.54      lukem     493:        struct socket   *so;
1.115     yamt      494:        uid_t           uid;
1.160     ad        495:        int             error;
                    496:        kmutex_t        *lock;
1.1       cgd       497:
1.132     elad      498:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET,
                    499:            KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type),
                    500:            KAUTH_ARG(proto));
1.140     dyoung    501:        if (error != 0)
                    502:                return error;
1.127     elad      503:
1.1       cgd       504:        if (proto)
                    505:                prp = pffindproto(dom, proto, type);
                    506:        else
                    507:                prp = pffindtype(dom, type);
1.140     dyoung    508:        if (prp == NULL) {
1.120     ginsbach  509:                /* no support for domain */
                    510:                if (pffinddomain(dom) == 0)
1.140     dyoung    511:                        return EAFNOSUPPORT;
1.120     ginsbach  512:                /* no support for socket type */
                    513:                if (proto == 0 && type != 0)
1.140     dyoung    514:                        return EPROTOTYPE;
                    515:                return EPROTONOSUPPORT;
1.120     ginsbach  516:        }
1.140     dyoung    517:        if (prp->pr_usrreq == NULL)
                    518:                return EPROTONOSUPPORT;
1.1       cgd       519:        if (prp->pr_type != type)
1.140     dyoung    520:                return EPROTOTYPE;
1.160     ad        521:
                    522:        so = soget(true);
1.1       cgd       523:        so->so_type = type;
                    524:        so->so_proto = prp;
1.33      matt      525:        so->so_send = sosend;
                    526:        so->so_receive = soreceive;
1.78      matt      527: #ifdef MBUFTRACE
                    528:        so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner;
                    529:        so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner;
                    530:        so->so_mowner = &prp->pr_domain->dom_mowner;
                    531: #endif
1.138     rmind     532:        uid = kauth_cred_geteuid(l->l_cred);
1.115     yamt      533:        so->so_uidinfo = uid_find(uid);
1.168     yamt      534:        so->so_cpid = l->l_proc->p_pid;
1.160     ad        535:        if (lockso != NULL) {
                    536:                /* Caller wants us to share a lock. */
                    537:                lock = lockso->so_lock;
                    538:                so->so_lock = lock;
                    539:                mutex_obj_hold(lock);
                    540:                mutex_enter(lock);
                    541:        } else {
                    542:                /* Lock assigned and taken during PRU_ATTACH. */
                    543:        }
1.140     dyoung    544:        error = (*prp->pr_usrreq)(so, PRU_ATTACH, NULL,
                    545:            (struct mbuf *)(long)proto, NULL, l);
1.160     ad        546:        KASSERT(solocked(so));
1.140     dyoung    547:        if (error != 0) {
1.1       cgd       548:                so->so_state |= SS_NOFDREF;
                    549:                sofree(so);
1.140     dyoung    550:                return error;
1.1       cgd       551:        }
1.198     elad      552:        so->so_cred = kauth_cred_dup(l->l_cred);
1.160     ad        553:        sounlock(so);
1.1       cgd       554:        *aso = so;
1.140     dyoung    555:        return 0;
1.1       cgd       556: }
                    557:
1.142     dyoung    558: /* On success, write file descriptor to fdout and return zero.  On
                    559:  * failure, return non-zero; *fdout will be undefined.
                    560:  */
                    561: int
                    562: fsocreate(int domain, struct socket **sop, int type, int protocol,
                    563:     struct lwp *l, int *fdout)
                    564: {
                    565:        struct socket   *so;
                    566:        struct file     *fp;
                    567:        int             fd, error;
1.204     christos  568:        int             flags = type & SOCK_FLAGS_MASK;
1.142     dyoung    569:
1.204     christos  570:        type &= ~SOCK_FLAGS_MASK;
1.155     ad        571:        if ((error = fd_allocfile(&fp, &fd)) != 0)
1.204     christos  572:                return error;
                    573:        fd_set_exclose(l, fd, (flags & SOCK_CLOEXEC) != 0);
1.207     christos  574:        fp->f_flag = FREAD|FWRITE|((flags & SOCK_NONBLOCK) ? FNONBLOCK : 0)|
                    575:            ((flags & SOCK_NOSIGPIPE) ? FNOSIGPIPE : 0);
1.142     dyoung    576:        fp->f_type = DTYPE_SOCKET;
                    577:        fp->f_ops = &socketops;
1.160     ad        578:        error = socreate(domain, &so, type, protocol, l, NULL);
1.142     dyoung    579:        if (error != 0) {
1.155     ad        580:                fd_abort(curproc, fp, fd);
1.142     dyoung    581:        } else {
                    582:                if (sop != NULL)
                    583:                        *sop = so;
                    584:                fp->f_data = so;
1.155     ad        585:                fd_affix(curproc, fp, fd);
1.142     dyoung    586:                *fdout = fd;
                    587:        }
                    588:        return error;
                    589: }
                    590:
1.3       andrew    591: int
1.190     dyoung    592: sofamily(const struct socket *so)
                    593: {
                    594:        const struct protosw *pr;
                    595:        const struct domain *dom;
                    596:
                    597:        if ((pr = so->so_proto) == NULL)
                    598:                return AF_UNSPEC;
                    599:        if ((dom = pr->pr_domain) == NULL)
                    600:                return AF_UNSPEC;
                    601:        return dom->dom_family;
                    602: }
                    603:
                    604: int
1.114     christos  605: sobind(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1       cgd       606: {
1.160     ad        607:        int     error;
1.1       cgd       608:
1.160     ad        609:        solock(so);
1.140     dyoung    610:        error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, NULL, nam, NULL, l);
1.160     ad        611:        sounlock(so);
1.140     dyoung    612:        return error;
1.1       cgd       613: }
                    614:
1.3       andrew    615: int
1.150     elad      616: solisten(struct socket *so, int backlog, struct lwp *l)
1.1       cgd       617: {
1.160     ad        618:        int     error;
1.1       cgd       619:
1.160     ad        620:        solock(so);
1.158     ad        621:        if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163     ad        622:            SS_ISDISCONNECTING)) != 0) {
                    623:                sounlock(so);
1.158     ad        624:                return (EOPNOTSUPP);
1.163     ad        625:        }
1.140     dyoung    626:        error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, NULL,
1.150     elad      627:            NULL, NULL, l);
1.140     dyoung    628:        if (error != 0) {
1.160     ad        629:                sounlock(so);
1.140     dyoung    630:                return error;
1.1       cgd       631:        }
1.63      matt      632:        if (TAILQ_EMPTY(&so->so_q))
1.1       cgd       633:                so->so_options |= SO_ACCEPTCONN;
                    634:        if (backlog < 0)
                    635:                backlog = 0;
1.49      jonathan  636:        so->so_qlimit = min(backlog, somaxconn);
1.160     ad        637:        sounlock(so);
1.140     dyoung    638:        return 0;
1.1       cgd       639: }
                    640:
1.21      christos  641: void
1.54      lukem     642: sofree(struct socket *so)
1.1       cgd       643: {
1.161     ad        644:        u_int refs;
1.1       cgd       645:
1.160     ad        646:        KASSERT(solocked(so));
                    647:
                    648:        if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
                    649:                sounlock(so);
1.1       cgd       650:                return;
1.160     ad        651:        }
1.43      mycroft   652:        if (so->so_head) {
                    653:                /*
                    654:                 * We must not decommission a socket that's on the accept(2)
                    655:                 * queue.  If we do, then accept(2) may hang after select(2)
                    656:                 * indicated that the listening socket was ready.
                    657:                 */
1.160     ad        658:                if (!soqremque(so, 0)) {
                    659:                        sounlock(so);
1.43      mycroft   660:                        return;
1.160     ad        661:                }
1.43      mycroft   662:        }
1.98      christos  663:        if (so->so_rcv.sb_hiwat)
1.110     christos  664:                (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98      christos  665:                    RLIM_INFINITY);
                    666:        if (so->so_snd.sb_hiwat)
1.110     christos  667:                (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98      christos  668:                    RLIM_INFINITY);
                    669:        sbrelease(&so->so_snd, so);
1.160     ad        670:        KASSERT(!cv_has_waiters(&so->so_cv));
                    671:        KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
                    672:        KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1       cgd       673:        sorflush(so);
1.161     ad        674:        refs = so->so_aborting; /* XXX */
1.177     ad        675:        /* Remove acccept filter if one is present. */
1.170     tls       676:        if (so->so_accf != NULL)
1.177     ad        677:                (void)accept_filt_clear(so);
1.160     ad        678:        sounlock(so);
1.161     ad        679:        if (refs == 0)          /* XXX */
                    680:                soput(so);
1.1       cgd       681: }
                    682:
                    683: /*
                    684:  * Close a socket on last file table reference removal.
                    685:  * Initiate disconnect if connected.
                    686:  * Free socket when disconnect complete.
                    687:  */
1.3       andrew    688: int
1.54      lukem     689: soclose(struct socket *so)
1.1       cgd       690: {
1.54      lukem     691:        struct socket   *so2;
1.160     ad        692:        int             error;
                    693:        int             error2;
1.1       cgd       694:
1.54      lukem     695:        error = 0;
1.160     ad        696:        solock(so);
1.1       cgd       697:        if (so->so_options & SO_ACCEPTCONN) {
1.172     ad        698:                for (;;) {
                    699:                        if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.160     ad        700:                                KASSERT(solocked2(so, so2));
                    701:                                (void) soqremque(so2, 0);
                    702:                                /* soabort drops the lock. */
                    703:                                (void) soabort(so2);
                    704:                                solock(so);
1.172     ad        705:                                continue;
1.160     ad        706:                        }
1.172     ad        707:                        if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.160     ad        708:                                KASSERT(solocked2(so, so2));
                    709:                                (void) soqremque(so2, 1);
                    710:                                /* soabort drops the lock. */
                    711:                                (void) soabort(so2);
                    712:                                solock(so);
1.172     ad        713:                                continue;
1.160     ad        714:                        }
1.172     ad        715:                        break;
                    716:                }
1.1       cgd       717:        }
                    718:        if (so->so_pcb == 0)
                    719:                goto discard;
                    720:        if (so->so_state & SS_ISCONNECTED) {
                    721:                if ((so->so_state & SS_ISDISCONNECTING) == 0) {
                    722:                        error = sodisconnect(so);
                    723:                        if (error)
                    724:                                goto drop;
                    725:                }
                    726:                if (so->so_options & SO_LINGER) {
1.206     christos  727:                        if ((so->so_state & (SS_ISDISCONNECTING|SS_NBIO)) ==
                    728:                            (SS_ISDISCONNECTING|SS_NBIO))
1.1       cgd       729:                                goto drop;
1.21      christos  730:                        while (so->so_state & SS_ISCONNECTED) {
1.185     yamt      731:                                error = sowait(so, true, so->so_linger * hz);
1.21      christos  732:                                if (error)
1.1       cgd       733:                                        break;
1.21      christos  734:                        }
1.1       cgd       735:                }
                    736:        }
1.54      lukem     737:  drop:
1.1       cgd       738:        if (so->so_pcb) {
1.160     ad        739:                error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
1.140     dyoung    740:                    NULL, NULL, NULL, NULL);
1.1       cgd       741:                if (error == 0)
                    742:                        error = error2;
                    743:        }
1.54      lukem     744:  discard:
1.1       cgd       745:        if (so->so_state & SS_NOFDREF)
                    746:                panic("soclose: NOFDREF");
1.198     elad      747:        kauth_cred_free(so->so_cred);
1.1       cgd       748:        so->so_state |= SS_NOFDREF;
                    749:        sofree(so);
                    750:        return (error);
                    751: }
                    752:
                    753: /*
1.160     ad        754:  * Must be called with the socket locked..  Will return with it unlocked.
1.1       cgd       755:  */
1.3       andrew    756: int
1.54      lukem     757: soabort(struct socket *so)
1.1       cgd       758: {
1.161     ad        759:        u_int refs;
1.139     yamt      760:        int error;
1.160     ad        761:
                    762:        KASSERT(solocked(so));
                    763:        KASSERT(so->so_head == NULL);
1.1       cgd       764:
1.161     ad        765:        so->so_aborting++;              /* XXX */
1.140     dyoung    766:        error = (*so->so_proto->pr_usrreq)(so, PRU_ABORT, NULL,
                    767:            NULL, NULL, NULL);
1.161     ad        768:        refs = --so->so_aborting;       /* XXX */
1.164     drochner  769:        if (error || (refs == 0)) {
1.139     yamt      770:                sofree(so);
1.160     ad        771:        } else {
                    772:                sounlock(so);
1.139     yamt      773:        }
                    774:        return error;
1.1       cgd       775: }
                    776:
1.3       andrew    777: int
1.54      lukem     778: soaccept(struct socket *so, struct mbuf *nam)
1.1       cgd       779: {
1.160     ad        780:        int     error;
                    781:
                    782:        KASSERT(solocked(so));
1.1       cgd       783:
1.54      lukem     784:        error = 0;
1.1       cgd       785:        if ((so->so_state & SS_NOFDREF) == 0)
                    786:                panic("soaccept: !NOFDREF");
                    787:        so->so_state &= ~SS_NOFDREF;
1.55      thorpej   788:        if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
                    789:            (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.41      mycroft   790:                error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT,
1.140     dyoung    791:                    NULL, nam, NULL, NULL);
1.41      mycroft   792:        else
1.53      itojun    793:                error = ECONNABORTED;
1.52      itojun    794:
1.1       cgd       795:        return (error);
                    796: }
                    797:
1.3       andrew    798: int
1.114     christos  799: soconnect(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1       cgd       800: {
1.160     ad        801:        int             error;
                    802:
                    803:        KASSERT(solocked(so));
1.1       cgd       804:
                    805:        if (so->so_options & SO_ACCEPTCONN)
                    806:                return (EOPNOTSUPP);
                    807:        /*
                    808:         * If protocol is connection-based, can only connect once.
                    809:         * Otherwise, if connected, try to disconnect first.
                    810:         * This allows user to disconnect by connecting to, e.g.,
                    811:         * a null address.
                    812:         */
                    813:        if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
                    814:            ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
                    815:            (error = sodisconnect(so))))
                    816:                error = EISCONN;
                    817:        else
                    818:                error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
1.140     dyoung    819:                    NULL, nam, NULL, l);
1.1       cgd       820:        return (error);
                    821: }
                    822:
1.3       andrew    823: int
1.54      lukem     824: soconnect2(struct socket *so1, struct socket *so2)
1.1       cgd       825: {
1.160     ad        826:        int     error;
                    827:
                    828:        KASSERT(solocked2(so1, so2));
1.1       cgd       829:
1.22      mycroft   830:        error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
1.140     dyoung    831:            NULL, (struct mbuf *)so2, NULL, NULL);
1.1       cgd       832:        return (error);
                    833: }
                    834:
1.3       andrew    835: int
1.54      lukem     836: sodisconnect(struct socket *so)
1.1       cgd       837: {
1.160     ad        838:        int     error;
                    839:
                    840:        KASSERT(solocked(so));
1.1       cgd       841:
                    842:        if ((so->so_state & SS_ISCONNECTED) == 0) {
                    843:                error = ENOTCONN;
1.160     ad        844:        } else if (so->so_state & SS_ISDISCONNECTING) {
1.1       cgd       845:                error = EALREADY;
1.160     ad        846:        } else {
                    847:                error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
                    848:                    NULL, NULL, NULL, NULL);
1.1       cgd       849:        }
                    850:        return (error);
                    851: }
                    852:
1.15      mycroft   853: #define        SBLOCKWAIT(f)   (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1       cgd       854: /*
                    855:  * Send on a socket.
                    856:  * If send must go all at once and message is larger than
                    857:  * send buffering, then hard error.
                    858:  * Lock against other senders.
                    859:  * If must go all at once and not enough room now, then
                    860:  * inform user that this would block and do nothing.
                    861:  * Otherwise, if nonblocking, send as much as possible.
                    862:  * The data to be sent is described by "uio" if nonzero,
                    863:  * otherwise by the mbuf chain "top" (which must be null
                    864:  * if uio is not).  Data provided in mbuf chain must be small
                    865:  * enough to send all at once.
                    866:  *
                    867:  * Returns nonzero on error, timeout or signal; callers
                    868:  * must check for short counts if EINTR/ERESTART are returned.
                    869:  * Data and control buffers are freed on return.
                    870:  */
1.3       andrew    871: int
1.54      lukem     872: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
1.114     christos  873:        struct mbuf *control, int flags, struct lwp *l)
1.1       cgd       874: {
1.54      lukem     875:        struct mbuf     **mp, *m;
1.114     christos  876:        struct proc     *p;
1.58      jdolecek  877:        long            space, len, resid, clen, mlen;
                    878:        int             error, s, dontroute, atomic;
1.196     dsl       879:        short           wakeup_state = 0;
1.54      lukem     880:
1.114     christos  881:        p = l->l_proc;
1.160     ad        882:        clen = 0;
1.64      thorpej   883:
1.160     ad        884:        /*
                    885:         * solock() provides atomicity of access.  splsoftnet() prevents
                    886:         * protocol processing soft interrupts from interrupting us and
                    887:         * blocking (expensive).
                    888:         */
                    889:        s = splsoftnet();
                    890:        solock(so);
1.54      lukem     891:        atomic = sosendallatonce(so) || top;
1.1       cgd       892:        if (uio)
                    893:                resid = uio->uio_resid;
                    894:        else
                    895:                resid = top->m_pkthdr.len;
1.7       cgd       896:        /*
                    897:         * In theory resid should be unsigned.
                    898:         * However, space must be signed, as it might be less than 0
                    899:         * if we over-committed, and we must use a signed comparison
                    900:         * of space and resid.  On the other hand, a negative resid
                    901:         * causes us to loop sending 0-length segments to the protocol.
                    902:         */
1.29      mycroft   903:        if (resid < 0) {
                    904:                error = EINVAL;
                    905:                goto out;
                    906:        }
1.1       cgd       907:        dontroute =
                    908:            (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
                    909:            (so->so_proto->pr_flags & PR_ATOMIC);
1.165     christos  910:        l->l_ru.ru_msgsnd++;
1.1       cgd       911:        if (control)
                    912:                clen = control->m_len;
1.54      lukem     913:  restart:
1.21      christos  914:        if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1       cgd       915:                goto out;
                    916:        do {
1.160     ad        917:                if (so->so_state & SS_CANTSENDMORE) {
                    918:                        error = EPIPE;
                    919:                        goto release;
                    920:                }
1.48      thorpej   921:                if (so->so_error) {
                    922:                        error = so->so_error;
                    923:                        so->so_error = 0;
                    924:                        goto release;
                    925:                }
1.1       cgd       926:                if ((so->so_state & SS_ISCONNECTED) == 0) {
                    927:                        if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
                    928:                                if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1.160     ad        929:                                    !(resid == 0 && clen != 0)) {
                    930:                                        error = ENOTCONN;
                    931:                                        goto release;
                    932:                                }
                    933:                        } else if (addr == 0) {
                    934:                                error = EDESTADDRREQ;
                    935:                                goto release;
                    936:                        }
1.1       cgd       937:                }
                    938:                space = sbspace(&so->so_snd);
                    939:                if (flags & MSG_OOB)
                    940:                        space += 1024;
1.21      christos  941:                if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160     ad        942:                    clen > so->so_snd.sb_hiwat) {
                    943:                        error = EMSGSIZE;
                    944:                        goto release;
                    945:                }
1.96      mycroft   946:                if (space < resid + clen &&
1.1       cgd       947:                    (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.206     christos  948:                        if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1.160     ad        949:                                error = EWOULDBLOCK;
                    950:                                goto release;
                    951:                        }
1.1       cgd       952:                        sbunlock(&so->so_snd);
1.196     dsl       953:                        if (wakeup_state & SS_RESTARTSYS) {
                    954:                                error = ERESTART;
                    955:                                goto out;
                    956:                        }
1.1       cgd       957:                        error = sbwait(&so->so_snd);
                    958:                        if (error)
                    959:                                goto out;
1.196     dsl       960:                        wakeup_state = so->so_state;
1.1       cgd       961:                        goto restart;
                    962:                }
1.196     dsl       963:                wakeup_state = 0;
1.1       cgd       964:                mp = &top;
                    965:                space -= clen;
                    966:                do {
1.45      tv        967:                        if (uio == NULL) {
                    968:                                /*
                    969:                                 * Data is prepackaged in "top".
                    970:                                 */
                    971:                                resid = 0;
                    972:                                if (flags & MSG_EOR)
                    973:                                        top->m_flags |= M_EOR;
                    974:                        } else do {
1.160     ad        975:                                sounlock(so);
                    976:                                splx(s);
1.144     dyoung    977:                                if (top == NULL) {
1.78      matt      978:                                        m = m_gethdr(M_WAIT, MT_DATA);
1.45      tv        979:                                        mlen = MHLEN;
                    980:                                        m->m_pkthdr.len = 0;
1.140     dyoung    981:                                        m->m_pkthdr.rcvif = NULL;
1.45      tv        982:                                } else {
1.78      matt      983:                                        m = m_get(M_WAIT, MT_DATA);
1.45      tv        984:                                        mlen = MLEN;
                    985:                                }
1.78      matt      986:                                MCLAIM(m, so->so_snd.sb_mowner);
1.121     yamt      987:                                if (sock_loan_thresh >= 0 &&
                    988:                                    uio->uio_iov->iov_len >= sock_loan_thresh &&
                    989:                                    space >= sock_loan_thresh &&
1.64      thorpej   990:                                    (len = sosend_loan(so, uio, m,
                    991:                                                       space)) != 0) {
                    992:                                        SOSEND_COUNTER_INCR(&sosend_loan_big);
                    993:                                        space -= len;
                    994:                                        goto have_data;
                    995:                                }
1.45      tv        996:                                if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64      thorpej   997:                                        SOSEND_COUNTER_INCR(&sosend_copy_big);
1.201     oki       998:                                        m_clget(m, M_DONTWAIT);
1.45      tv        999:                                        if ((m->m_flags & M_EXT) == 0)
                   1000:                                                goto nopages;
                   1001:                                        mlen = MCLBYTES;
                   1002:                                        if (atomic && top == 0) {
1.58      jdolecek 1003:                                                len = lmin(MCLBYTES - max_hdr,
1.54      lukem    1004:                                                    resid);
1.45      tv       1005:                                                m->m_data += max_hdr;
                   1006:                                        } else
1.58      jdolecek 1007:                                                len = lmin(MCLBYTES, resid);
1.45      tv       1008:                                        space -= len;
                   1009:                                } else {
1.64      thorpej  1010:  nopages:
                   1011:                                        SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58      jdolecek 1012:                                        len = lmin(lmin(mlen, resid), space);
1.45      tv       1013:                                        space -= len;
                   1014:                                        /*
                   1015:                                         * For datagram protocols, leave room
                   1016:                                         * for protocol headers in first mbuf.
                   1017:                                         */
                   1018:                                        if (atomic && top == 0 && len < mlen)
                   1019:                                                MH_ALIGN(m, len);
                   1020:                                }
1.144     dyoung   1021:                                error = uiomove(mtod(m, void *), (int)len, uio);
1.64      thorpej  1022:  have_data:
1.45      tv       1023:                                resid = uio->uio_resid;
                   1024:                                m->m_len = len;
                   1025:                                *mp = m;
                   1026:                                top->m_pkthdr.len += len;
1.160     ad       1027:                                s = splsoftnet();
                   1028:                                solock(so);
1.144     dyoung   1029:                                if (error != 0)
1.45      tv       1030:                                        goto release;
                   1031:                                mp = &m->m_next;
                   1032:                                if (resid <= 0) {
                   1033:                                        if (flags & MSG_EOR)
                   1034:                                                top->m_flags |= M_EOR;
                   1035:                                        break;
                   1036:                                }
                   1037:                        } while (space > 0 && atomic);
1.108     perry    1038:
1.160     ad       1039:                        if (so->so_state & SS_CANTSENDMORE) {
                   1040:                                error = EPIPE;
                   1041:                                goto release;
                   1042:                        }
1.45      tv       1043:                        if (dontroute)
                   1044:                                so->so_options |= SO_DONTROUTE;
                   1045:                        if (resid > 0)
                   1046:                                so->so_state |= SS_MORETOCOME;
1.46      sommerfe 1047:                        error = (*so->so_proto->pr_usrreq)(so,
                   1048:                            (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
1.160     ad       1049:                            top, addr, control, curlwp);
1.45      tv       1050:                        if (dontroute)
                   1051:                                so->so_options &= ~SO_DONTROUTE;
                   1052:                        if (resid > 0)
                   1053:                                so->so_state &= ~SS_MORETOCOME;
                   1054:                        clen = 0;
1.144     dyoung   1055:                        control = NULL;
                   1056:                        top = NULL;
1.45      tv       1057:                        mp = &top;
1.144     dyoung   1058:                        if (error != 0)
1.1       cgd      1059:                                goto release;
                   1060:                } while (resid && space > 0);
                   1061:        } while (resid);
                   1062:
1.54      lukem    1063:  release:
1.1       cgd      1064:        sbunlock(&so->so_snd);
1.54      lukem    1065:  out:
1.160     ad       1066:        sounlock(so);
                   1067:        splx(s);
1.1       cgd      1068:        if (top)
                   1069:                m_freem(top);
                   1070:        if (control)
                   1071:                m_freem(control);
                   1072:        return (error);
                   1073: }
                   1074:
                   1075: /*
1.159     ad       1076:  * Following replacement or removal of the first mbuf on the first
                   1077:  * mbuf chain of a socket buffer, push necessary state changes back
                   1078:  * into the socket buffer so that other consumers see the values
                   1079:  * consistently.  'nextrecord' is the callers locally stored value of
                   1080:  * the original value of sb->sb_mb->m_nextpkt which must be restored
                   1081:  * when the lead mbuf changes.  NOTE: 'nextrecord' may be NULL.
                   1082:  */
                   1083: static void
                   1084: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
                   1085: {
                   1086:
1.160     ad       1087:        KASSERT(solocked(sb->sb_so));
                   1088:
1.159     ad       1089:        /*
                   1090:         * First, update for the new value of nextrecord.  If necessary,
                   1091:         * make it the first record.
                   1092:         */
                   1093:        if (sb->sb_mb != NULL)
                   1094:                sb->sb_mb->m_nextpkt = nextrecord;
                   1095:        else
                   1096:                sb->sb_mb = nextrecord;
                   1097:
                   1098:         /*
                   1099:          * Now update any dependent socket buffer fields to reflect
                   1100:          * the new state.  This is an inline of SB_EMPTY_FIXUP, with
                   1101:          * the addition of a second clause that takes care of the
                   1102:          * case where sb_mb has been updated, but remains the last
                   1103:          * record.
                   1104:          */
                   1105:         if (sb->sb_mb == NULL) {
                   1106:                 sb->sb_mbtail = NULL;
                   1107:                 sb->sb_lastrecord = NULL;
                   1108:         } else if (sb->sb_mb->m_nextpkt == NULL)
                   1109:                 sb->sb_lastrecord = sb->sb_mb;
                   1110: }
                   1111:
                   1112: /*
1.1       cgd      1113:  * Implement receive operations on a socket.
                   1114:  * We depend on the way that records are added to the sockbuf
                   1115:  * by sbappend*.  In particular, each record (mbufs linked through m_next)
                   1116:  * must begin with an address if the protocol so specifies,
                   1117:  * followed by an optional mbuf or mbufs containing ancillary data,
                   1118:  * and then zero or more mbufs of data.
                   1119:  * In order to avoid blocking network interrupts for the entire time here,
                   1120:  * we splx() while doing the actual copy to user space.
                   1121:  * Although the sockbuf is locked, new data may still be appended,
                   1122:  * and thus we must maintain consistency of the sockbuf during that time.
                   1123:  *
                   1124:  * The caller may receive the data as a single mbuf chain by supplying
                   1125:  * an mbuf **mp0 for use in returning the chain.  The uio is then used
                   1126:  * only for the count in uio_resid.
                   1127:  */
1.3       andrew   1128: int
1.54      lukem    1129: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
                   1130:        struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1       cgd      1131: {
1.116     yamt     1132:        struct lwp *l = curlwp;
1.160     ad       1133:        struct mbuf     *m, **mp, *mt;
1.146     dyoung   1134:        int atomic, flags, len, error, s, offset, moff, type, orig_resid;
1.99      matt     1135:        const struct protosw    *pr;
1.54      lukem    1136:        struct mbuf     *nextrecord;
1.67      he       1137:        int             mbuf_removed = 0;
1.146     dyoung   1138:        const struct domain *dom;
1.196     dsl      1139:        short           wakeup_state = 0;
1.64      thorpej  1140:
1.54      lukem    1141:        pr = so->so_proto;
1.146     dyoung   1142:        atomic = pr->pr_flags & PR_ATOMIC;
                   1143:        dom = pr->pr_domain;
1.1       cgd      1144:        mp = mp0;
1.54      lukem    1145:        type = 0;
                   1146:        orig_resid = uio->uio_resid;
1.102     jonathan 1147:
1.144     dyoung   1148:        if (paddr != NULL)
                   1149:                *paddr = NULL;
                   1150:        if (controlp != NULL)
                   1151:                *controlp = NULL;
                   1152:        if (flagsp != NULL)
1.1       cgd      1153:                flags = *flagsp &~ MSG_EOR;
                   1154:        else
                   1155:                flags = 0;
1.66      enami    1156:
1.1       cgd      1157:        if (flags & MSG_OOB) {
                   1158:                m = m_get(M_WAIT, MT_DATA);
1.160     ad       1159:                solock(so);
1.17      cgd      1160:                error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
1.140     dyoung   1161:                    (struct mbuf *)(long)(flags & MSG_PEEK), NULL, l);
1.160     ad       1162:                sounlock(so);
1.1       cgd      1163:                if (error)
                   1164:                        goto bad;
                   1165:                do {
1.134     christos 1166:                        error = uiomove(mtod(m, void *),
1.1       cgd      1167:                            (int) min(uio->uio_resid, m->m_len), uio);
                   1168:                        m = m_free(m);
1.144     dyoung   1169:                } while (uio->uio_resid > 0 && error == 0 && m);
1.54      lukem    1170:  bad:
1.144     dyoung   1171:                if (m != NULL)
1.1       cgd      1172:                        m_freem(m);
1.144     dyoung   1173:                return error;
1.1       cgd      1174:        }
1.144     dyoung   1175:        if (mp != NULL)
1.140     dyoung   1176:                *mp = NULL;
1.160     ad       1177:
                   1178:        /*
                   1179:         * solock() provides atomicity of access.  splsoftnet() prevents
                   1180:         * protocol processing soft interrupts from interrupting us and
                   1181:         * blocking (expensive).
                   1182:         */
                   1183:        s = splsoftnet();
                   1184:        solock(so);
1.1       cgd      1185:        if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
1.140     dyoung   1186:                (*pr->pr_usrreq)(so, PRU_RCVD, NULL, NULL, NULL, l);
1.1       cgd      1187:
1.54      lukem    1188:  restart:
1.160     ad       1189:        if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
                   1190:                sounlock(so);
                   1191:                splx(s);
1.144     dyoung   1192:                return error;
1.160     ad       1193:        }
1.1       cgd      1194:
                   1195:        m = so->so_rcv.sb_mb;
                   1196:        /*
                   1197:         * If we have less data than requested, block awaiting more
                   1198:         * (subject to any timeout) if:
1.15      mycroft  1199:         *   1. the current count is less than the low water mark,
1.1       cgd      1200:         *   2. MSG_WAITALL is set, and it is possible to do the entire
1.15      mycroft  1201:         *      receive operation at once if we block (resid <= hiwat), or
                   1202:         *   3. MSG_DONTWAIT is not set.
1.1       cgd      1203:         * If MSG_WAITALL is set but resid is larger than the receive buffer,
                   1204:         * we have to do the receive in sections, and thus risk returning
                   1205:         * a short count if a timeout or signal occurs after we start.
                   1206:         */
1.144     dyoung   1207:        if (m == NULL ||
                   1208:            ((flags & MSG_DONTWAIT) == 0 &&
                   1209:             so->so_rcv.sb_cc < uio->uio_resid &&
                   1210:             (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
                   1211:              ((flags & MSG_WAITALL) &&
                   1212:               uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146     dyoung   1213:             m->m_nextpkt == NULL && !atomic)) {
1.1       cgd      1214: #ifdef DIAGNOSTIC
1.144     dyoung   1215:                if (m == NULL && so->so_rcv.sb_cc)
1.1       cgd      1216:                        panic("receive 1");
                   1217: #endif
                   1218:                if (so->so_error) {
1.144     dyoung   1219:                        if (m != NULL)
1.15      mycroft  1220:                                goto dontblock;
1.1       cgd      1221:                        error = so->so_error;
                   1222:                        if ((flags & MSG_PEEK) == 0)
                   1223:                                so->so_error = 0;
                   1224:                        goto release;
                   1225:                }
                   1226:                if (so->so_state & SS_CANTRCVMORE) {
1.144     dyoung   1227:                        if (m != NULL)
1.15      mycroft  1228:                                goto dontblock;
1.1       cgd      1229:                        else
                   1230:                                goto release;
                   1231:                }
1.144     dyoung   1232:                for (; m != NULL; m = m->m_next)
1.1       cgd      1233:                        if (m->m_type == MT_OOBDATA  || (m->m_flags & M_EOR)) {
                   1234:                                m = so->so_rcv.sb_mb;
                   1235:                                goto dontblock;
                   1236:                        }
                   1237:                if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
                   1238:                    (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
                   1239:                        error = ENOTCONN;
                   1240:                        goto release;
                   1241:                }
                   1242:                if (uio->uio_resid == 0)
                   1243:                        goto release;
1.206     christos 1244:                if ((so->so_state & SS_NBIO) ||
                   1245:                    (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1.1       cgd      1246:                        error = EWOULDBLOCK;
                   1247:                        goto release;
                   1248:                }
1.69      thorpej  1249:                SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
                   1250:                SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1       cgd      1251:                sbunlock(&so->so_rcv);
1.196     dsl      1252:                if (wakeup_state & SS_RESTARTSYS)
                   1253:                        error = ERESTART;
                   1254:                else
                   1255:                        error = sbwait(&so->so_rcv);
1.160     ad       1256:                if (error != 0) {
                   1257:                        sounlock(so);
                   1258:                        splx(s);
1.144     dyoung   1259:                        return error;
1.160     ad       1260:                }
1.196     dsl      1261:                wakeup_state = so->so_state;
1.1       cgd      1262:                goto restart;
                   1263:        }
1.54      lukem    1264:  dontblock:
1.69      thorpej  1265:        /*
                   1266:         * On entry here, m points to the first record of the socket buffer.
1.159     ad       1267:         * From this point onward, we maintain 'nextrecord' as a cache of the
                   1268:         * pointer to the next record in the socket buffer.  We must keep the
                   1269:         * various socket buffer pointers and local stack versions of the
                   1270:         * pointers in sync, pushing out modifications before dropping the
1.160     ad       1271:         * socket lock, and re-reading them when picking it up.
1.159     ad       1272:         *
                   1273:         * Otherwise, we will race with the network stack appending new data
                   1274:         * or records onto the socket buffer by using inconsistent/stale
                   1275:         * versions of the field, possibly resulting in socket buffer
                   1276:         * corruption.
                   1277:         *
                   1278:         * By holding the high-level sblock(), we prevent simultaneous
                   1279:         * readers from pulling off the front of the socket buffer.
1.69      thorpej  1280:         */
1.144     dyoung   1281:        if (l != NULL)
1.157     ad       1282:                l->l_ru.ru_msgrcv++;
1.69      thorpej  1283:        KASSERT(m == so->so_rcv.sb_mb);
                   1284:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
                   1285:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1       cgd      1286:        nextrecord = m->m_nextpkt;
                   1287:        if (pr->pr_flags & PR_ADDR) {
                   1288: #ifdef DIAGNOSTIC
                   1289:                if (m->m_type != MT_SONAME)
                   1290:                        panic("receive 1a");
                   1291: #endif
1.3       andrew   1292:                orig_resid = 0;
1.1       cgd      1293:                if (flags & MSG_PEEK) {
                   1294:                        if (paddr)
                   1295:                                *paddr = m_copy(m, 0, m->m_len);
                   1296:                        m = m->m_next;
                   1297:                } else {
                   1298:                        sbfree(&so->so_rcv, m);
1.67      he       1299:                        mbuf_removed = 1;
1.144     dyoung   1300:                        if (paddr != NULL) {
1.1       cgd      1301:                                *paddr = m;
                   1302:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1303:                                m->m_next = NULL;
1.1       cgd      1304:                                m = so->so_rcv.sb_mb;
                   1305:                        } else {
                   1306:                                MFREE(m, so->so_rcv.sb_mb);
                   1307:                                m = so->so_rcv.sb_mb;
                   1308:                        }
1.159     ad       1309:                        sbsync(&so->so_rcv, nextrecord);
1.1       cgd      1310:                }
                   1311:        }
1.159     ad       1312:
                   1313:        /*
                   1314:         * Process one or more MT_CONTROL mbufs present before any data mbufs
                   1315:         * in the first mbuf chain on the socket buffer.  If MSG_PEEK, we
                   1316:         * just copy the data; if !MSG_PEEK, we call into the protocol to
                   1317:         * perform externalization (or freeing if controlp == NULL).
                   1318:         */
                   1319:        if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
                   1320:                struct mbuf *cm = NULL, *cmn;
                   1321:                struct mbuf **cme = &cm;
                   1322:
                   1323:                do {
                   1324:                        if (flags & MSG_PEEK) {
                   1325:                                if (controlp != NULL) {
                   1326:                                        *controlp = m_copy(m, 0, m->m_len);
                   1327:                                        controlp = &(*controlp)->m_next;
                   1328:                                }
                   1329:                                m = m->m_next;
                   1330:                        } else {
                   1331:                                sbfree(&so->so_rcv, m);
1.1       cgd      1332:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1333:                                m->m_next = NULL;
1.159     ad       1334:                                *cme = m;
                   1335:                                cme = &(*cme)->m_next;
1.1       cgd      1336:                                m = so->so_rcv.sb_mb;
1.159     ad       1337:                        }
                   1338:                } while (m != NULL && m->m_type == MT_CONTROL);
                   1339:                if ((flags & MSG_PEEK) == 0)
                   1340:                        sbsync(&so->so_rcv, nextrecord);
                   1341:                for (; cm != NULL; cm = cmn) {
                   1342:                        cmn = cm->m_next;
                   1343:                        cm->m_next = NULL;
                   1344:                        type = mtod(cm, struct cmsghdr *)->cmsg_type;
                   1345:                        if (controlp != NULL) {
                   1346:                                if (dom->dom_externalize != NULL &&
                   1347:                                    type == SCM_RIGHTS) {
1.160     ad       1348:                                        sounlock(so);
1.159     ad       1349:                                        splx(s);
1.204     christos 1350:                                        error = (*dom->dom_externalize)(cm, l,
                   1351:                                            (flags & MSG_CMSG_CLOEXEC) ?
                   1352:                                            O_CLOEXEC : 0);
1.159     ad       1353:                                        s = splsoftnet();
1.160     ad       1354:                                        solock(so);
1.159     ad       1355:                                }
                   1356:                                *controlp = cm;
                   1357:                                while (*controlp != NULL)
                   1358:                                        controlp = &(*controlp)->m_next;
1.1       cgd      1359:                        } else {
1.106     itojun   1360:                                /*
                   1361:                                 * Dispose of any SCM_RIGHTS message that went
                   1362:                                 * through the read path rather than recv.
                   1363:                                 */
1.159     ad       1364:                                if (dom->dom_dispose != NULL &&
                   1365:                                    type == SCM_RIGHTS) {
1.160     ad       1366:                                        sounlock(so);
1.159     ad       1367:                                        (*dom->dom_dispose)(cm);
1.160     ad       1368:                                        solock(so);
1.159     ad       1369:                                }
                   1370:                                m_freem(cm);
1.1       cgd      1371:                        }
                   1372:                }
1.159     ad       1373:                if (m != NULL)
                   1374:                        nextrecord = so->so_rcv.sb_mb->m_nextpkt;
                   1375:                else
                   1376:                        nextrecord = so->so_rcv.sb_mb;
                   1377:                orig_resid = 0;
1.1       cgd      1378:        }
1.69      thorpej  1379:
1.159     ad       1380:        /* If m is non-NULL, we have some data to read. */
                   1381:        if (__predict_true(m != NULL)) {
1.1       cgd      1382:                type = m->m_type;
                   1383:                if (type == MT_OOBDATA)
                   1384:                        flags |= MSG_OOB;
                   1385:        }
1.69      thorpej  1386:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
                   1387:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
                   1388:
1.1       cgd      1389:        moff = 0;
                   1390:        offset = 0;
1.144     dyoung   1391:        while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1       cgd      1392:                if (m->m_type == MT_OOBDATA) {
                   1393:                        if (type != MT_OOBDATA)
                   1394:                                break;
                   1395:                } else if (type == MT_OOBDATA)
                   1396:                        break;
                   1397: #ifdef DIAGNOSTIC
                   1398:                else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
                   1399:                        panic("receive 3");
                   1400: #endif
                   1401:                so->so_state &= ~SS_RCVATMARK;
1.196     dsl      1402:                wakeup_state = 0;
1.1       cgd      1403:                len = uio->uio_resid;
                   1404:                if (so->so_oobmark && len > so->so_oobmark - offset)
                   1405:                        len = so->so_oobmark - offset;
                   1406:                if (len > m->m_len - moff)
                   1407:                        len = m->m_len - moff;
                   1408:                /*
                   1409:                 * If mp is set, just pass back the mbufs.
                   1410:                 * Otherwise copy them out via the uio, then free.
                   1411:                 * Sockbuf must be consistent here (points to current mbuf,
                   1412:                 * it points to next record) when we drop priority;
                   1413:                 * we must note any additions to the sockbuf when we
                   1414:                 * block interrupts again.
                   1415:                 */
1.144     dyoung   1416:                if (mp == NULL) {
1.69      thorpej  1417:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
                   1418:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160     ad       1419:                        sounlock(so);
1.1       cgd      1420:                        splx(s);
1.134     christos 1421:                        error = uiomove(mtod(m, char *) + moff, (int)len, uio);
1.20      mycroft  1422:                        s = splsoftnet();
1.160     ad       1423:                        solock(so);
1.144     dyoung   1424:                        if (error != 0) {
1.67      he       1425:                                /*
                   1426:                                 * If any part of the record has been removed
                   1427:                                 * (such as the MT_SONAME mbuf, which will
                   1428:                                 * happen when PR_ADDR, and thus also
                   1429:                                 * PR_ATOMIC, is set), then drop the entire
                   1430:                                 * record to maintain the atomicity of the
                   1431:                                 * receive operation.
                   1432:                                 *
                   1433:                                 * This avoids a later panic("receive 1a")
                   1434:                                 * when compiled with DIAGNOSTIC.
                   1435:                                 */
1.146     dyoung   1436:                                if (m && mbuf_removed && atomic)
1.67      he       1437:                                        (void) sbdroprecord(&so->so_rcv);
                   1438:
1.57      jdolecek 1439:                                goto release;
1.67      he       1440:                        }
1.1       cgd      1441:                } else
                   1442:                        uio->uio_resid -= len;
                   1443:                if (len == m->m_len - moff) {
                   1444:                        if (m->m_flags & M_EOR)
                   1445:                                flags |= MSG_EOR;
                   1446:                        if (flags & MSG_PEEK) {
                   1447:                                m = m->m_next;
                   1448:                                moff = 0;
                   1449:                        } else {
                   1450:                                nextrecord = m->m_nextpkt;
                   1451:                                sbfree(&so->so_rcv, m);
                   1452:                                if (mp) {
                   1453:                                        *mp = m;
                   1454:                                        mp = &m->m_next;
                   1455:                                        so->so_rcv.sb_mb = m = m->m_next;
1.140     dyoung   1456:                                        *mp = NULL;
1.1       cgd      1457:                                } else {
                   1458:                                        MFREE(m, so->so_rcv.sb_mb);
                   1459:                                        m = so->so_rcv.sb_mb;
                   1460:                                }
1.69      thorpej  1461:                                /*
                   1462:                                 * If m != NULL, we also know that
                   1463:                                 * so->so_rcv.sb_mb != NULL.
                   1464:                                 */
                   1465:                                KASSERT(so->so_rcv.sb_mb == m);
                   1466:                                if (m) {
1.1       cgd      1467:                                        m->m_nextpkt = nextrecord;
1.69      thorpej  1468:                                        if (nextrecord == NULL)
                   1469:                                                so->so_rcv.sb_lastrecord = m;
                   1470:                                } else {
                   1471:                                        so->so_rcv.sb_mb = nextrecord;
1.70      thorpej  1472:                                        SB_EMPTY_FIXUP(&so->so_rcv);
1.69      thorpej  1473:                                }
                   1474:                                SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
                   1475:                                SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1       cgd      1476:                        }
1.144     dyoung   1477:                } else if (flags & MSG_PEEK)
                   1478:                        moff += len;
                   1479:                else {
1.160     ad       1480:                        if (mp != NULL) {
                   1481:                                mt = m_copym(m, 0, len, M_NOWAIT);
                   1482:                                if (__predict_false(mt == NULL)) {
                   1483:                                        sounlock(so);
                   1484:                                        mt = m_copym(m, 0, len, M_WAIT);
                   1485:                                        solock(so);
                   1486:                                }
                   1487:                                *mp = mt;
                   1488:                        }
1.144     dyoung   1489:                        m->m_data += len;
                   1490:                        m->m_len -= len;
                   1491:                        so->so_rcv.sb_cc -= len;
1.1       cgd      1492:                }
                   1493:                if (so->so_oobmark) {
                   1494:                        if ((flags & MSG_PEEK) == 0) {
                   1495:                                so->so_oobmark -= len;
                   1496:                                if (so->so_oobmark == 0) {
                   1497:                                        so->so_state |= SS_RCVATMARK;
                   1498:                                        break;
                   1499:                                }
1.7       cgd      1500:                        } else {
1.1       cgd      1501:                                offset += len;
1.7       cgd      1502:                                if (offset == so->so_oobmark)
                   1503:                                        break;
                   1504:                        }
1.1       cgd      1505:                }
                   1506:                if (flags & MSG_EOR)
                   1507:                        break;
                   1508:                /*
                   1509:                 * If the MSG_WAITALL flag is set (for non-atomic socket),
                   1510:                 * we must not quit until "uio->uio_resid == 0" or an error
                   1511:                 * termination.  If a signal/timeout occurs, return
                   1512:                 * with a short count but without error.
                   1513:                 * Keep sockbuf locked against other readers.
                   1514:                 */
1.144     dyoung   1515:                while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3       andrew   1516:                    !sosendallatonce(so) && !nextrecord) {
1.1       cgd      1517:                        if (so->so_error || so->so_state & SS_CANTRCVMORE)
                   1518:                                break;
1.68      matt     1519:                        /*
                   1520:                         * If we are peeking and the socket receive buffer is
                   1521:                         * full, stop since we can't get more data to peek at.
                   1522:                         */
                   1523:                        if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
                   1524:                                break;
                   1525:                        /*
                   1526:                         * If we've drained the socket buffer, tell the
                   1527:                         * protocol in case it needs to do something to
                   1528:                         * get it filled again.
                   1529:                         */
                   1530:                        if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
                   1531:                                (*pr->pr_usrreq)(so, PRU_RCVD,
1.140     dyoung   1532:                                    NULL, (struct mbuf *)(long)flags, NULL, l);
1.69      thorpej  1533:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
                   1534:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196     dsl      1535:                        if (wakeup_state & SS_RESTARTSYS)
                   1536:                                error = ERESTART;
                   1537:                        else
                   1538:                                error = sbwait(&so->so_rcv);
1.144     dyoung   1539:                        if (error != 0) {
1.1       cgd      1540:                                sbunlock(&so->so_rcv);
1.160     ad       1541:                                sounlock(so);
1.1       cgd      1542:                                splx(s);
1.144     dyoung   1543:                                return 0;
1.1       cgd      1544:                        }
1.21      christos 1545:                        if ((m = so->so_rcv.sb_mb) != NULL)
1.1       cgd      1546:                                nextrecord = m->m_nextpkt;
1.196     dsl      1547:                        wakeup_state = so->so_state;
1.1       cgd      1548:                }
                   1549:        }
1.3       andrew   1550:
1.146     dyoung   1551:        if (m && atomic) {
1.3       andrew   1552:                flags |= MSG_TRUNC;
                   1553:                if ((flags & MSG_PEEK) == 0)
                   1554:                        (void) sbdroprecord(&so->so_rcv);
                   1555:        }
1.1       cgd      1556:        if ((flags & MSG_PEEK) == 0) {
1.144     dyoung   1557:                if (m == NULL) {
1.69      thorpej  1558:                        /*
1.70      thorpej  1559:                         * First part is an inline SB_EMPTY_FIXUP().  Second
1.69      thorpej  1560:                         * part makes sure sb_lastrecord is up-to-date if
                   1561:                         * there is still data in the socket buffer.
                   1562:                         */
1.1       cgd      1563:                        so->so_rcv.sb_mb = nextrecord;
1.69      thorpej  1564:                        if (so->so_rcv.sb_mb == NULL) {
                   1565:                                so->so_rcv.sb_mbtail = NULL;
                   1566:                                so->so_rcv.sb_lastrecord = NULL;
                   1567:                        } else if (nextrecord->m_nextpkt == NULL)
                   1568:                                so->so_rcv.sb_lastrecord = nextrecord;
                   1569:                }
                   1570:                SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
                   1571:                SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1       cgd      1572:                if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.140     dyoung   1573:                        (*pr->pr_usrreq)(so, PRU_RCVD, NULL,
                   1574:                            (struct mbuf *)(long)flags, NULL, l);
1.1       cgd      1575:        }
1.3       andrew   1576:        if (orig_resid == uio->uio_resid && orig_resid &&
                   1577:            (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
                   1578:                sbunlock(&so->so_rcv);
                   1579:                goto restart;
                   1580:        }
1.108     perry    1581:
1.144     dyoung   1582:        if (flagsp != NULL)
1.1       cgd      1583:                *flagsp |= flags;
1.54      lukem    1584:  release:
1.1       cgd      1585:        sbunlock(&so->so_rcv);
1.160     ad       1586:        sounlock(so);
1.1       cgd      1587:        splx(s);
1.144     dyoung   1588:        return error;
1.1       cgd      1589: }
                   1590:
1.14      mycroft  1591: int
1.54      lukem    1592: soshutdown(struct socket *so, int how)
1.1       cgd      1593: {
1.99      matt     1594:        const struct protosw    *pr;
1.160     ad       1595:        int     error;
                   1596:
                   1597:        KASSERT(solocked(so));
1.34      kleink   1598:
1.54      lukem    1599:        pr = so->so_proto;
1.34      kleink   1600:        if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
                   1601:                return (EINVAL);
1.1       cgd      1602:
1.160     ad       1603:        if (how == SHUT_RD || how == SHUT_RDWR) {
1.1       cgd      1604:                sorflush(so);
1.160     ad       1605:                error = 0;
                   1606:        }
1.34      kleink   1607:        if (how == SHUT_WR || how == SHUT_RDWR)
1.160     ad       1608:                error = (*pr->pr_usrreq)(so, PRU_SHUTDOWN, NULL,
1.140     dyoung   1609:                    NULL, NULL, NULL);
1.160     ad       1610:
                   1611:        return error;
1.1       cgd      1612: }
                   1613:
1.195     dsl      1614: void
1.196     dsl      1615: sorestart(struct socket *so)
1.188     ad       1616: {
1.196     dsl      1617:        /*
                   1618:         * An application has called close() on an fd on which another
                   1619:         * of its threads has called a socket system call.
                   1620:         * Mark this and wake everyone up, and code that would block again
                   1621:         * instead returns ERESTART.
                   1622:         * On system call re-entry the fd is validated and EBADF returned.
                   1623:         * Any other fd will block again on the 2nd syscall.
                   1624:         */
1.188     ad       1625:        solock(so);
1.196     dsl      1626:        so->so_state |= SS_RESTARTSYS;
1.188     ad       1627:        cv_broadcast(&so->so_cv);
1.196     dsl      1628:        cv_broadcast(&so->so_snd.sb_cv);
                   1629:        cv_broadcast(&so->so_rcv.sb_cv);
1.188     ad       1630:        sounlock(so);
                   1631: }
                   1632:
1.14      mycroft  1633: void
1.54      lukem    1634: sorflush(struct socket *so)
1.1       cgd      1635: {
1.54      lukem    1636:        struct sockbuf  *sb, asb;
1.99      matt     1637:        const struct protosw    *pr;
1.160     ad       1638:
                   1639:        KASSERT(solocked(so));
1.1       cgd      1640:
1.54      lukem    1641:        sb = &so->so_rcv;
                   1642:        pr = so->so_proto;
1.160     ad       1643:        socantrcvmore(so);
1.1       cgd      1644:        sb->sb_flags |= SB_NOINTR;
1.160     ad       1645:        (void )sblock(sb, M_WAITOK);
1.1       cgd      1646:        sbunlock(sb);
                   1647:        asb = *sb;
1.86      wrstuden 1648:        /*
                   1649:         * Clear most of the sockbuf structure, but leave some of the
                   1650:         * fields valid.
                   1651:         */
                   1652:        memset(&sb->sb_startzero, 0,
                   1653:            sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160     ad       1654:        if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
                   1655:                sounlock(so);
1.1       cgd      1656:                (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160     ad       1657:                solock(so);
                   1658:        }
1.98      christos 1659:        sbrelease(&asb, so);
1.1       cgd      1660: }
                   1661:
1.171     plunky   1662: /*
                   1663:  * internal set SOL_SOCKET options
                   1664:  */
1.142     dyoung   1665: static int
1.171     plunky   1666: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1       cgd      1667: {
1.182     christos 1668:        int error = EINVAL, optval, opt;
1.171     plunky   1669:        struct linger l;
                   1670:        struct timeval tv;
1.142     dyoung   1671:
1.179     christos 1672:        switch ((opt = sopt->sopt_name)) {
1.142     dyoung   1673:
1.170     tls      1674:        case SO_ACCEPTFILTER:
1.177     ad       1675:                error = accept_filt_setopt(so, sopt);
                   1676:                KASSERT(solocked(so));
1.170     tls      1677:                break;
                   1678:
1.171     plunky   1679:        case SO_LINGER:
                   1680:                error = sockopt_get(sopt, &l, sizeof(l));
1.177     ad       1681:                solock(so);
1.171     plunky   1682:                if (error)
1.177     ad       1683:                        break;
1.171     plunky   1684:                if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1.177     ad       1685:                    l.l_linger > (INT_MAX / hz)) {
                   1686:                        error = EDOM;
                   1687:                        break;
                   1688:                }
1.171     plunky   1689:                so->so_linger = l.l_linger;
                   1690:                if (l.l_onoff)
                   1691:                        so->so_options |= SO_LINGER;
                   1692:                else
                   1693:                        so->so_options &= ~SO_LINGER;
1.177     ad       1694:                break;
1.1       cgd      1695:
1.142     dyoung   1696:        case SO_DEBUG:
                   1697:        case SO_KEEPALIVE:
                   1698:        case SO_DONTROUTE:
                   1699:        case SO_USELOOPBACK:
                   1700:        case SO_BROADCAST:
                   1701:        case SO_REUSEADDR:
                   1702:        case SO_REUSEPORT:
                   1703:        case SO_OOBINLINE:
                   1704:        case SO_TIMESTAMP:
1.207     christos 1705:        case SO_NOSIGPIPE:
1.184     christos 1706: #ifdef SO_OTIMESTAMP
                   1707:        case SO_OTIMESTAMP:
                   1708: #endif
1.171     plunky   1709:                error = sockopt_getint(sopt, &optval);
1.177     ad       1710:                solock(so);
1.171     plunky   1711:                if (error)
1.177     ad       1712:                        break;
1.171     plunky   1713:                if (optval)
1.179     christos 1714:                        so->so_options |= opt;
1.142     dyoung   1715:                else
1.179     christos 1716:                        so->so_options &= ~opt;
1.142     dyoung   1717:                break;
                   1718:
                   1719:        case SO_SNDBUF:
                   1720:        case SO_RCVBUF:
                   1721:        case SO_SNDLOWAT:
                   1722:        case SO_RCVLOWAT:
1.171     plunky   1723:                error = sockopt_getint(sopt, &optval);
1.177     ad       1724:                solock(so);
1.171     plunky   1725:                if (error)
1.177     ad       1726:                        break;
1.1       cgd      1727:
1.142     dyoung   1728:                /*
                   1729:                 * Values < 1 make no sense for any of these
                   1730:                 * options, so disallow them.
                   1731:                 */
1.177     ad       1732:                if (optval < 1) {
                   1733:                        error = EINVAL;
                   1734:                        break;
                   1735:                }
1.1       cgd      1736:
1.179     christos 1737:                switch (opt) {
1.171     plunky   1738:                case SO_SNDBUF:
1.177     ad       1739:                        if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
                   1740:                                error = ENOBUFS;
                   1741:                                break;
                   1742:                        }
1.171     plunky   1743:                        so->so_snd.sb_flags &= ~SB_AUTOSIZE;
                   1744:                        break;
1.1       cgd      1745:
                   1746:                case SO_RCVBUF:
1.177     ad       1747:                        if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
                   1748:                                error = ENOBUFS;
                   1749:                                break;
                   1750:                        }
1.171     plunky   1751:                        so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142     dyoung   1752:                        break;
                   1753:
                   1754:                /*
                   1755:                 * Make sure the low-water is never greater than
                   1756:                 * the high-water.
                   1757:                 */
1.1       cgd      1758:                case SO_SNDLOWAT:
1.171     plunky   1759:                        if (optval > so->so_snd.sb_hiwat)
                   1760:                                optval = so->so_snd.sb_hiwat;
                   1761:
                   1762:                        so->so_snd.sb_lowat = optval;
1.142     dyoung   1763:                        break;
1.171     plunky   1764:
1.1       cgd      1765:                case SO_RCVLOWAT:
1.171     plunky   1766:                        if (optval > so->so_rcv.sb_hiwat)
                   1767:                                optval = so->so_rcv.sb_hiwat;
                   1768:
                   1769:                        so->so_rcv.sb_lowat = optval;
1.142     dyoung   1770:                        break;
                   1771:                }
                   1772:                break;
1.28      thorpej  1773:
1.179     christos 1774: #ifdef COMPAT_50
                   1775:        case SO_OSNDTIMEO:
                   1776:        case SO_ORCVTIMEO: {
                   1777:                struct timeval50 otv;
                   1778:                error = sockopt_get(sopt, &otv, sizeof(otv));
1.186     pooka    1779:                if (error) {
                   1780:                        solock(so);
1.183     christos 1781:                        break;
1.186     pooka    1782:                }
1.179     christos 1783:                timeval50_to_timeval(&otv, &tv);
                   1784:                opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182     christos 1785:                error = 0;
1.179     christos 1786:                /*FALLTHROUGH*/
                   1787:        }
                   1788: #endif /* COMPAT_50 */
                   1789:
1.142     dyoung   1790:        case SO_SNDTIMEO:
                   1791:        case SO_RCVTIMEO:
1.182     christos 1792:                if (error)
1.179     christos 1793:                        error = sockopt_get(sopt, &tv, sizeof(tv));
1.177     ad       1794:                solock(so);
1.171     plunky   1795:                if (error)
1.177     ad       1796:                        break;
1.171     plunky   1797:
1.177     ad       1798:                if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
                   1799:                        error = EDOM;
                   1800:                        break;
                   1801:                }
1.28      thorpej  1802:
1.171     plunky   1803:                optval = tv.tv_sec * hz + tv.tv_usec / tick;
                   1804:                if (optval == 0 && tv.tv_usec != 0)
                   1805:                        optval = 1;
1.28      thorpej  1806:
1.179     christos 1807:                switch (opt) {
1.142     dyoung   1808:                case SO_SNDTIMEO:
1.171     plunky   1809:                        so->so_snd.sb_timeo = optval;
1.1       cgd      1810:                        break;
                   1811:                case SO_RCVTIMEO:
1.171     plunky   1812:                        so->so_rcv.sb_timeo = optval;
1.142     dyoung   1813:                        break;
                   1814:                }
                   1815:                break;
1.1       cgd      1816:
1.142     dyoung   1817:        default:
1.177     ad       1818:                solock(so);
                   1819:                error = ENOPROTOOPT;
                   1820:                break;
1.142     dyoung   1821:        }
1.177     ad       1822:        KASSERT(solocked(so));
                   1823:        return error;
1.142     dyoung   1824: }
1.1       cgd      1825:
1.142     dyoung   1826: int
1.171     plunky   1827: sosetopt(struct socket *so, struct sockopt *sopt)
1.142     dyoung   1828: {
                   1829:        int error, prerr;
1.1       cgd      1830:
1.177     ad       1831:        if (sopt->sopt_level == SOL_SOCKET) {
1.171     plunky   1832:                error = sosetopt1(so, sopt);
1.177     ad       1833:                KASSERT(solocked(so));
                   1834:        } else {
1.142     dyoung   1835:                error = ENOPROTOOPT;
1.177     ad       1836:                solock(so);
                   1837:        }
1.1       cgd      1838:
1.142     dyoung   1839:        if ((error == 0 || error == ENOPROTOOPT) &&
                   1840:            so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
                   1841:                /* give the protocol stack a shot */
1.171     plunky   1842:                prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142     dyoung   1843:                if (prerr == 0)
                   1844:                        error = 0;
                   1845:                else if (prerr != ENOPROTOOPT)
                   1846:                        error = prerr;
1.171     plunky   1847:        }
1.160     ad       1848:        sounlock(so);
1.142     dyoung   1849:        return error;
1.1       cgd      1850: }
                   1851:
1.171     plunky   1852: /*
                   1853:  * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
                   1854:  */
                   1855: int
                   1856: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
                   1857:     const void *val, size_t valsize)
                   1858: {
                   1859:        struct sockopt sopt;
                   1860:        int error;
                   1861:
                   1862:        KASSERT(valsize == 0 || val != NULL);
                   1863:
                   1864:        sockopt_init(&sopt, level, name, valsize);
                   1865:        sockopt_set(&sopt, val, valsize);
                   1866:
                   1867:        error = sosetopt(so, &sopt);
                   1868:
                   1869:        sockopt_destroy(&sopt);
                   1870:
                   1871:        return error;
                   1872: }
                   1873:
                   1874: /*
                   1875:  * internal get SOL_SOCKET options
                   1876:  */
                   1877: static int
                   1878: sogetopt1(struct socket *so, struct sockopt *sopt)
                   1879: {
1.179     christos 1880:        int error, optval, opt;
1.171     plunky   1881:        struct linger l;
                   1882:        struct timeval tv;
                   1883:
1.179     christos 1884:        switch ((opt = sopt->sopt_name)) {
1.171     plunky   1885:
                   1886:        case SO_ACCEPTFILTER:
1.177     ad       1887:                error = accept_filt_getopt(so, sopt);
1.171     plunky   1888:                break;
                   1889:
                   1890:        case SO_LINGER:
                   1891:                l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
                   1892:                l.l_linger = so->so_linger;
                   1893:
                   1894:                error = sockopt_set(sopt, &l, sizeof(l));
                   1895:                break;
                   1896:
                   1897:        case SO_USELOOPBACK:
                   1898:        case SO_DONTROUTE:
                   1899:        case SO_DEBUG:
                   1900:        case SO_KEEPALIVE:
                   1901:        case SO_REUSEADDR:
                   1902:        case SO_REUSEPORT:
                   1903:        case SO_BROADCAST:
                   1904:        case SO_OOBINLINE:
                   1905:        case SO_TIMESTAMP:
1.207     christos 1906:        case SO_NOSIGPIPE:
1.184     christos 1907: #ifdef SO_OTIMESTAMP
                   1908:        case SO_OTIMESTAMP:
                   1909: #endif
1.179     christos 1910:                error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171     plunky   1911:                break;
                   1912:
                   1913:        case SO_TYPE:
                   1914:                error = sockopt_setint(sopt, so->so_type);
                   1915:                break;
                   1916:
                   1917:        case SO_ERROR:
                   1918:                error = sockopt_setint(sopt, so->so_error);
                   1919:                so->so_error = 0;
                   1920:                break;
                   1921:
                   1922:        case SO_SNDBUF:
                   1923:                error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
                   1924:                break;
                   1925:
                   1926:        case SO_RCVBUF:
                   1927:                error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
                   1928:                break;
                   1929:
                   1930:        case SO_SNDLOWAT:
                   1931:                error = sockopt_setint(sopt, so->so_snd.sb_lowat);
                   1932:                break;
                   1933:
                   1934:        case SO_RCVLOWAT:
                   1935:                error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
                   1936:                break;
                   1937:
1.179     christos 1938: #ifdef COMPAT_50
                   1939:        case SO_OSNDTIMEO:
                   1940:        case SO_ORCVTIMEO: {
                   1941:                struct timeval50 otv;
                   1942:
                   1943:                optval = (opt == SO_OSNDTIMEO ?
                   1944:                     so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
                   1945:
                   1946:                otv.tv_sec = optval / hz;
                   1947:                otv.tv_usec = (optval % hz) * tick;
                   1948:
                   1949:                error = sockopt_set(sopt, &otv, sizeof(otv));
                   1950:                break;
                   1951:        }
                   1952: #endif /* COMPAT_50 */
                   1953:
1.171     plunky   1954:        case SO_SNDTIMEO:
                   1955:        case SO_RCVTIMEO:
1.179     christos 1956:                optval = (opt == SO_SNDTIMEO ?
1.171     plunky   1957:                     so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
                   1958:
                   1959:                tv.tv_sec = optval / hz;
                   1960:                tv.tv_usec = (optval % hz) * tick;
                   1961:
                   1962:                error = sockopt_set(sopt, &tv, sizeof(tv));
                   1963:                break;
                   1964:
                   1965:        case SO_OVERFLOWED:
                   1966:                error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
                   1967:                break;
                   1968:
                   1969:        default:
                   1970:                error = ENOPROTOOPT;
                   1971:                break;
                   1972:        }
                   1973:
                   1974:        return (error);
                   1975: }
                   1976:
1.14      mycroft  1977: int
1.171     plunky   1978: sogetopt(struct socket *so, struct sockopt *sopt)
1.1       cgd      1979: {
1.160     ad       1980:        int             error;
1.1       cgd      1981:
1.160     ad       1982:        solock(so);
1.171     plunky   1983:        if (sopt->sopt_level != SOL_SOCKET) {
1.1       cgd      1984:                if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160     ad       1985:                        error = ((*so->so_proto->pr_ctloutput)
1.171     plunky   1986:                            (PRCO_GETOPT, so, sopt));
1.1       cgd      1987:                } else
1.160     ad       1988:                        error = (ENOPROTOOPT);
1.1       cgd      1989:        } else {
1.171     plunky   1990:                error = sogetopt1(so, sopt);
                   1991:        }
                   1992:        sounlock(so);
                   1993:        return (error);
                   1994: }
                   1995:
                   1996: /*
                   1997:  * alloc sockopt data buffer buffer
                   1998:  *     - will be released at destroy
                   1999:  */
1.176     plunky   2000: static int
                   2001: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171     plunky   2002: {
                   2003:
                   2004:        KASSERT(sopt->sopt_size == 0);
                   2005:
1.176     plunky   2006:        if (len > sizeof(sopt->sopt_buf)) {
                   2007:                sopt->sopt_data = kmem_zalloc(len, kmflag);
                   2008:                if (sopt->sopt_data == NULL)
                   2009:                        return ENOMEM;
                   2010:        } else
1.171     plunky   2011:                sopt->sopt_data = sopt->sopt_buf;
                   2012:
                   2013:        sopt->sopt_size = len;
1.176     plunky   2014:        return 0;
1.171     plunky   2015: }
                   2016:
                   2017: /*
                   2018:  * initialise sockopt storage
1.176     plunky   2019:  *     - MAY sleep during allocation
1.171     plunky   2020:  */
                   2021: void
                   2022: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
                   2023: {
1.1       cgd      2024:
1.171     plunky   2025:        memset(sopt, 0, sizeof(*sopt));
1.1       cgd      2026:
1.171     plunky   2027:        sopt->sopt_level = level;
                   2028:        sopt->sopt_name = name;
1.176     plunky   2029:        (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171     plunky   2030: }
                   2031:
                   2032: /*
                   2033:  * destroy sockopt storage
                   2034:  *     - will release any held memory references
                   2035:  */
                   2036: void
                   2037: sockopt_destroy(struct sockopt *sopt)
                   2038: {
                   2039:
                   2040:        if (sopt->sopt_data != sopt->sopt_buf)
1.173     plunky   2041:                kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171     plunky   2042:
                   2043:        memset(sopt, 0, sizeof(*sopt));
                   2044: }
                   2045:
                   2046: /*
                   2047:  * set sockopt value
                   2048:  *     - value is copied into sockopt
1.176     plunky   2049:  *     - memory is allocated when necessary, will not sleep
1.171     plunky   2050:  */
                   2051: int
                   2052: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
                   2053: {
1.176     plunky   2054:        int error;
1.171     plunky   2055:
1.176     plunky   2056:        if (sopt->sopt_size == 0) {
                   2057:                error = sockopt_alloc(sopt, len, KM_NOSLEEP);
                   2058:                if (error)
                   2059:                        return error;
                   2060:        }
1.171     plunky   2061:
                   2062:        KASSERT(sopt->sopt_size == len);
                   2063:        memcpy(sopt->sopt_data, buf, len);
                   2064:        return 0;
                   2065: }
                   2066:
                   2067: /*
                   2068:  * common case of set sockopt integer value
                   2069:  */
                   2070: int
                   2071: sockopt_setint(struct sockopt *sopt, int val)
                   2072: {
                   2073:
                   2074:        return sockopt_set(sopt, &val, sizeof(int));
                   2075: }
                   2076:
                   2077: /*
                   2078:  * get sockopt value
                   2079:  *     - correct size must be given
                   2080:  */
                   2081: int
                   2082: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
                   2083: {
1.170     tls      2084:
1.171     plunky   2085:        if (sopt->sopt_size != len)
                   2086:                return EINVAL;
1.1       cgd      2087:
1.171     plunky   2088:        memcpy(buf, sopt->sopt_data, len);
                   2089:        return 0;
                   2090: }
1.1       cgd      2091:
1.171     plunky   2092: /*
                   2093:  * common case of get sockopt integer value
                   2094:  */
                   2095: int
                   2096: sockopt_getint(const struct sockopt *sopt, int *valp)
                   2097: {
1.1       cgd      2098:
1.171     plunky   2099:        return sockopt_get(sopt, valp, sizeof(int));
                   2100: }
1.1       cgd      2101:
1.171     plunky   2102: /*
                   2103:  * set sockopt value from mbuf
                   2104:  *     - ONLY for legacy code
                   2105:  *     - mbuf is released by sockopt
1.176     plunky   2106:  *     - will not sleep
1.171     plunky   2107:  */
                   2108: int
                   2109: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
                   2110: {
                   2111:        size_t len;
1.176     plunky   2112:        int error;
1.1       cgd      2113:
1.171     plunky   2114:        len = m_length(m);
1.1       cgd      2115:
1.176     plunky   2116:        if (sopt->sopt_size == 0) {
                   2117:                error = sockopt_alloc(sopt, len, KM_NOSLEEP);
                   2118:                if (error)
                   2119:                        return error;
                   2120:        }
1.1       cgd      2121:
1.171     plunky   2122:        KASSERT(sopt->sopt_size == len);
                   2123:        m_copydata(m, 0, len, sopt->sopt_data);
                   2124:        m_freem(m);
1.1       cgd      2125:
1.171     plunky   2126:        return 0;
                   2127: }
1.1       cgd      2128:
1.171     plunky   2129: /*
                   2130:  * get sockopt value into mbuf
                   2131:  *     - ONLY for legacy code
                   2132:  *     - mbuf to be released by the caller
1.176     plunky   2133:  *     - will not sleep
1.171     plunky   2134:  */
                   2135: struct mbuf *
                   2136: sockopt_getmbuf(const struct sockopt *sopt)
                   2137: {
                   2138:        struct mbuf *m;
1.107     darrenr  2139:
1.176     plunky   2140:        if (sopt->sopt_size > MCLBYTES)
                   2141:                return NULL;
                   2142:
                   2143:        m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171     plunky   2144:        if (m == NULL)
                   2145:                return NULL;
                   2146:
1.176     plunky   2147:        if (sopt->sopt_size > MLEN) {
                   2148:                MCLGET(m, M_DONTWAIT);
                   2149:                if ((m->m_flags & M_EXT) == 0) {
                   2150:                        m_free(m);
                   2151:                        return NULL;
                   2152:                }
1.1       cgd      2153:        }
1.176     plunky   2154:
                   2155:        memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
                   2156:        m->m_len = sopt->sopt_size;
1.160     ad       2157:
1.171     plunky   2158:        return m;
1.1       cgd      2159: }
                   2160:
1.14      mycroft  2161: void
1.54      lukem    2162: sohasoutofband(struct socket *so)
1.1       cgd      2163: {
1.153     rmind    2164:
1.90      christos 2165:        fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189     ad       2166:        selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1       cgd      2167: }
1.72      jdolecek 2168:
                   2169: static void
                   2170: filt_sordetach(struct knote *kn)
                   2171: {
                   2172:        struct socket   *so;
                   2173:
1.155     ad       2174:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2175:        solock(so);
1.73      christos 2176:        SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
                   2177:        if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72      jdolecek 2178:                so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160     ad       2179:        sounlock(so);
1.72      jdolecek 2180: }
                   2181:
                   2182: /*ARGSUSED*/
                   2183: static int
1.129     yamt     2184: filt_soread(struct knote *kn, long hint)
1.72      jdolecek 2185: {
                   2186:        struct socket   *so;
1.160     ad       2187:        int rv;
1.72      jdolecek 2188:
1.155     ad       2189:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2190:        if (hint != NOTE_SUBMIT)
                   2191:                solock(so);
1.72      jdolecek 2192:        kn->kn_data = so->so_rcv.sb_cc;
                   2193:        if (so->so_state & SS_CANTRCVMORE) {
1.108     perry    2194:                kn->kn_flags |= EV_EOF;
1.72      jdolecek 2195:                kn->kn_fflags = so->so_error;
1.160     ad       2196:                rv = 1;
                   2197:        } else if (so->so_error)        /* temporary udp error */
                   2198:                rv = 1;
                   2199:        else if (kn->kn_sfflags & NOTE_LOWAT)
                   2200:                rv = (kn->kn_data >= kn->kn_sdata);
                   2201:        else
                   2202:                rv = (kn->kn_data >= so->so_rcv.sb_lowat);
                   2203:        if (hint != NOTE_SUBMIT)
                   2204:                sounlock(so);
                   2205:        return rv;
1.72      jdolecek 2206: }
                   2207:
                   2208: static void
                   2209: filt_sowdetach(struct knote *kn)
                   2210: {
                   2211:        struct socket   *so;
                   2212:
1.155     ad       2213:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2214:        solock(so);
1.73      christos 2215:        SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
                   2216:        if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72      jdolecek 2217:                so->so_snd.sb_flags &= ~SB_KNOTE;
1.160     ad       2218:        sounlock(so);
1.72      jdolecek 2219: }
                   2220:
                   2221: /*ARGSUSED*/
                   2222: static int
1.129     yamt     2223: filt_sowrite(struct knote *kn, long hint)
1.72      jdolecek 2224: {
                   2225:        struct socket   *so;
1.160     ad       2226:        int rv;
1.72      jdolecek 2227:
1.155     ad       2228:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2229:        if (hint != NOTE_SUBMIT)
                   2230:                solock(so);
1.72      jdolecek 2231:        kn->kn_data = sbspace(&so->so_snd);
                   2232:        if (so->so_state & SS_CANTSENDMORE) {
1.108     perry    2233:                kn->kn_flags |= EV_EOF;
1.72      jdolecek 2234:                kn->kn_fflags = so->so_error;
1.160     ad       2235:                rv = 1;
                   2236:        } else if (so->so_error)        /* temporary udp error */
                   2237:                rv = 1;
                   2238:        else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72      jdolecek 2239:            (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160     ad       2240:                rv = 0;
                   2241:        else if (kn->kn_sfflags & NOTE_LOWAT)
                   2242:                rv = (kn->kn_data >= kn->kn_sdata);
                   2243:        else
                   2244:                rv = (kn->kn_data >= so->so_snd.sb_lowat);
                   2245:        if (hint != NOTE_SUBMIT)
                   2246:                sounlock(so);
                   2247:        return rv;
1.72      jdolecek 2248: }
                   2249:
                   2250: /*ARGSUSED*/
                   2251: static int
1.129     yamt     2252: filt_solisten(struct knote *kn, long hint)
1.72      jdolecek 2253: {
                   2254:        struct socket   *so;
1.160     ad       2255:        int rv;
1.72      jdolecek 2256:
1.155     ad       2257:        so = ((file_t *)kn->kn_obj)->f_data;
1.72      jdolecek 2258:
                   2259:        /*
                   2260:         * Set kn_data to number of incoming connections, not
                   2261:         * counting partial (incomplete) connections.
1.108     perry    2262:         */
1.160     ad       2263:        if (hint != NOTE_SUBMIT)
                   2264:                solock(so);
1.72      jdolecek 2265:        kn->kn_data = so->so_qlen;
1.160     ad       2266:        rv = (kn->kn_data > 0);
                   2267:        if (hint != NOTE_SUBMIT)
                   2268:                sounlock(so);
                   2269:        return rv;
1.72      jdolecek 2270: }
                   2271:
                   2272: static const struct filterops solisten_filtops =
                   2273:        { 1, NULL, filt_sordetach, filt_solisten };
                   2274: static const struct filterops soread_filtops =
                   2275:        { 1, NULL, filt_sordetach, filt_soread };
                   2276: static const struct filterops sowrite_filtops =
                   2277:        { 1, NULL, filt_sowdetach, filt_sowrite };
                   2278:
                   2279: int
1.129     yamt     2280: soo_kqfilter(struct file *fp, struct knote *kn)
1.72      jdolecek 2281: {
                   2282:        struct socket   *so;
                   2283:        struct sockbuf  *sb;
                   2284:
1.155     ad       2285:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2286:        solock(so);
1.72      jdolecek 2287:        switch (kn->kn_filter) {
                   2288:        case EVFILT_READ:
                   2289:                if (so->so_options & SO_ACCEPTCONN)
                   2290:                        kn->kn_fop = &solisten_filtops;
                   2291:                else
                   2292:                        kn->kn_fop = &soread_filtops;
                   2293:                sb = &so->so_rcv;
                   2294:                break;
                   2295:        case EVFILT_WRITE:
                   2296:                kn->kn_fop = &sowrite_filtops;
                   2297:                sb = &so->so_snd;
                   2298:                break;
                   2299:        default:
1.160     ad       2300:                sounlock(so);
1.149     pooka    2301:                return (EINVAL);
1.72      jdolecek 2302:        }
1.73      christos 2303:        SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72      jdolecek 2304:        sb->sb_flags |= SB_KNOTE;
1.160     ad       2305:        sounlock(so);
1.72      jdolecek 2306:        return (0);
                   2307: }
                   2308:
1.154     ad       2309: static int
                   2310: sodopoll(struct socket *so, int events)
                   2311: {
                   2312:        int revents;
                   2313:
                   2314:        revents = 0;
                   2315:
                   2316:        if (events & (POLLIN | POLLRDNORM))
                   2317:                if (soreadable(so))
                   2318:                        revents |= events & (POLLIN | POLLRDNORM);
                   2319:
                   2320:        if (events & (POLLOUT | POLLWRNORM))
                   2321:                if (sowritable(so))
                   2322:                        revents |= events & (POLLOUT | POLLWRNORM);
                   2323:
                   2324:        if (events & (POLLPRI | POLLRDBAND))
                   2325:                if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
                   2326:                        revents |= events & (POLLPRI | POLLRDBAND);
                   2327:
                   2328:        return revents;
                   2329: }
                   2330:
                   2331: int
                   2332: sopoll(struct socket *so, int events)
                   2333: {
                   2334:        int revents = 0;
                   2335:
1.160     ad       2336: #ifndef DIAGNOSTIC
                   2337:        /*
                   2338:         * Do a quick, unlocked check in expectation that the socket
                   2339:         * will be ready for I/O.  Don't do this check if DIAGNOSTIC,
                   2340:         * as the solocked() assertions will fail.
                   2341:         */
1.154     ad       2342:        if ((revents = sodopoll(so, events)) != 0)
                   2343:                return revents;
1.160     ad       2344: #endif
1.154     ad       2345:
1.160     ad       2346:        solock(so);
1.154     ad       2347:        if ((revents = sodopoll(so, events)) == 0) {
                   2348:                if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
                   2349:                        selrecord(curlwp, &so->so_rcv.sb_sel);
1.160     ad       2350:                        so->so_rcv.sb_flags |= SB_NOTIFY;
1.154     ad       2351:                }
                   2352:
                   2353:                if (events & (POLLOUT | POLLWRNORM)) {
                   2354:                        selrecord(curlwp, &so->so_snd.sb_sel);
1.160     ad       2355:                        so->so_snd.sb_flags |= SB_NOTIFY;
1.154     ad       2356:                }
                   2357:        }
1.160     ad       2358:        sounlock(so);
1.154     ad       2359:
                   2360:        return revents;
                   2361: }
                   2362:
                   2363:
1.94      yamt     2364: #include <sys/sysctl.h>
                   2365:
                   2366: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
                   2367:
                   2368: /*
                   2369:  * sysctl helper routine for kern.somaxkva.  ensures that the given
                   2370:  * value is not too small.
                   2371:  * (XXX should we maybe make sure it's not too large as well?)
                   2372:  */
                   2373: static int
                   2374: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
                   2375: {
                   2376:        int error, new_somaxkva;
                   2377:        struct sysctlnode node;
                   2378:
                   2379:        new_somaxkva = somaxkva;
                   2380:        node = *rnode;
                   2381:        node.sysctl_data = &new_somaxkva;
                   2382:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2383:        if (error || newp == NULL)
                   2384:                return (error);
                   2385:
                   2386:        if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
                   2387:                return (EINVAL);
                   2388:
1.136     ad       2389:        mutex_enter(&so_pendfree_lock);
1.94      yamt     2390:        somaxkva = new_somaxkva;
1.136     ad       2391:        cv_broadcast(&socurkva_cv);
                   2392:        mutex_exit(&so_pendfree_lock);
1.94      yamt     2393:
                   2394:        return (error);
                   2395: }
                   2396:
1.178     pooka    2397: static void
1.187     cegger   2398: sysctl_kern_somaxkva_setup(void)
1.94      yamt     2399: {
                   2400:
1.178     pooka    2401:        KASSERT(socket_sysctllog == NULL);
                   2402:        sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97      atatat   2403:                       CTLFLAG_PERMANENT,
                   2404:                       CTLTYPE_NODE, "kern", NULL,
                   2405:                       NULL, 0, NULL, 0,
                   2406:                       CTL_KERN, CTL_EOL);
                   2407:
1.178     pooka    2408:        sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97      atatat   2409:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103     atatat   2410:                       CTLTYPE_INT, "somaxkva",
                   2411:                       SYSCTL_DESCR("Maximum amount of kernel memory to be "
                   2412:                                    "used for socket buffers"),
1.94      yamt     2413:                       sysctl_kern_somaxkva, 0, NULL, 0,
                   2414:                       CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
                   2415: }

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