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Annotation of src/sys/kern/uipc_socket.c, Revision 1.159

1.159   ! ad          1: /*     $NetBSD: uipc_socket.c,v 1.158 2008/03/28 12:12:20 ad Exp $     */
1.64      thorpej     2:
                      3: /*-
1.154     ad          4:  * Copyright (c) 2002, 2007, 2008 The NetBSD Foundation, Inc.
1.64      thorpej     5:  * All rights reserved.
                      6:  *
                      7:  * This code is derived from software contributed to The NetBSD Foundation
                      8:  * by Jason R. Thorpe of Wasabi Systems, Inc.
                      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:  * 3. All advertising materials mentioning features or use of this software
                     19:  *    must display the following acknowledgement:
                     20:  *     This product includes software developed by the NetBSD
                     21:  *     Foundation, Inc. and its contributors.
                     22:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     23:  *    contributors may be used to endorse or promote products derived
                     24:  *    from this software without specific prior written permission.
                     25:  *
                     26:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     27:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     28:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     29:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     30:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     31:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     32:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     33:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     34:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     35:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     36:  * POSSIBILITY OF SUCH DAMAGE.
                     37:  */
1.16      cgd        38:
1.1       cgd        39: /*
1.159   ! ad         40:  * Copyright (c) 2004 The FreeBSD Foundation
        !            41:  * Copyright (c) 2004 Robert Watson
1.15      mycroft    42:  * Copyright (c) 1982, 1986, 1988, 1990, 1993
                     43:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        44:  *
                     45:  * Redistribution and use in source and binary forms, with or without
                     46:  * modification, are permitted provided that the following conditions
                     47:  * are met:
                     48:  * 1. Redistributions of source code must retain the above copyright
                     49:  *    notice, this list of conditions and the following disclaimer.
                     50:  * 2. Redistributions in binary form must reproduce the above copyright
                     51:  *    notice, this list of conditions and the following disclaimer in the
                     52:  *    documentation and/or other materials provided with the distribution.
1.85      agc        53:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        54:  *    may be used to endorse or promote products derived from this software
                     55:  *    without specific prior written permission.
                     56:  *
                     57:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     58:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     59:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     60:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     61:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     62:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     63:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     64:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     65:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     66:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     67:  * SUCH DAMAGE.
                     68:  *
1.32      fvdl       69:  *     @(#)uipc_socket.c       8.6 (Berkeley) 5/2/95
1.1       cgd        70:  */
1.59      lukem      71:
                     72: #include <sys/cdefs.h>
1.159   ! ad         73: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.158 2008/03/28 12:12:20 ad Exp $");
1.64      thorpej    74:
                     75: #include "opt_sock_counters.h"
                     76: #include "opt_sosend_loan.h"
1.81      martin     77: #include "opt_mbuftrace.h"
1.84      ragge      78: #include "opt_somaxkva.h"
1.1       cgd        79:
1.9       mycroft    80: #include <sys/param.h>
                     81: #include <sys/systm.h>
                     82: #include <sys/proc.h>
                     83: #include <sys/file.h>
1.142     dyoung     84: #include <sys/filedesc.h>
1.9       mycroft    85: #include <sys/malloc.h>
                     86: #include <sys/mbuf.h>
                     87: #include <sys/domain.h>
                     88: #include <sys/kernel.h>
                     89: #include <sys/protosw.h>
                     90: #include <sys/socket.h>
                     91: #include <sys/socketvar.h>
1.21      christos   92: #include <sys/signalvar.h>
1.9       mycroft    93: #include <sys/resourcevar.h>
1.37      thorpej    94: #include <sys/pool.h>
1.72      jdolecek   95: #include <sys/event.h>
1.89      christos   96: #include <sys/poll.h>
1.118     elad       97: #include <sys/kauth.h>
1.136     ad         98: #include <sys/mutex.h>
                     99: #include <sys/condvar.h>
1.37      thorpej   100:
1.64      thorpej   101: #include <uvm/uvm.h>
                    102:
1.135     ad        103: POOL_INIT(socket_pool, sizeof(struct socket), 0, 0, 0, "sockpl", NULL,
                    104:     IPL_SOFTNET);
1.77      thorpej   105:
                    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;
1.49      jonathan  113:
1.64      thorpej   114: #ifdef SOSEND_COUNTERS
                    115: #include <sys/device.h>
                    116:
1.113     thorpej   117: static struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   118:     NULL, "sosend", "loan big");
1.113     thorpej   119: static struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   120:     NULL, "sosend", "copy big");
1.113     thorpej   121: static struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   122:     NULL, "sosend", "copy small");
1.113     thorpej   123: static struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   124:     NULL, "sosend", "kva limit");
                    125:
                    126: #define        SOSEND_COUNTER_INCR(ev)         (ev)->ev_count++
                    127:
1.101     matt      128: EVCNT_ATTACH_STATIC(sosend_loan_big);
                    129: EVCNT_ATTACH_STATIC(sosend_copy_big);
                    130: EVCNT_ATTACH_STATIC(sosend_copy_small);
                    131: EVCNT_ATTACH_STATIC(sosend_kvalimit);
1.64      thorpej   132: #else
                    133:
                    134: #define        SOSEND_COUNTER_INCR(ev)         /* nothing */
                    135:
                    136: #endif /* SOSEND_COUNTERS */
                    137:
1.119     yamt      138: static struct callback_entry sokva_reclaimerentry;
1.1       cgd       139:
1.71      thorpej   140: #ifdef SOSEND_NO_LOAN
1.121     yamt      141: int sock_loan_thresh = -1;
1.71      thorpej   142: #else
1.121     yamt      143: int sock_loan_thresh = 4096;
1.65      thorpej   144: #endif
1.64      thorpej   145:
1.136     ad        146: static kmutex_t so_pendfree_lock;
1.113     thorpej   147: static struct mbuf *so_pendfree;
1.64      thorpej   148:
1.84      ragge     149: #ifndef SOMAXKVA
                    150: #define        SOMAXKVA (16 * 1024 * 1024)
                    151: #endif
                    152: int somaxkva = SOMAXKVA;
1.113     thorpej   153: static int socurkva;
1.136     ad        154: static kcondvar_t socurkva_cv;
1.64      thorpej   155:
                    156: #define        SOCK_LOAN_CHUNK         65536
                    157:
1.117     yamt      158: static size_t sodopendfree(void);
                    159: static size_t sodopendfreel(void);
1.93      yamt      160:
1.113     thorpej   161: static vsize_t
1.129     yamt      162: sokvareserve(struct socket *so, vsize_t len)
1.80      yamt      163: {
1.98      christos  164:        int error;
1.80      yamt      165:
1.136     ad        166:        mutex_enter(&so_pendfree_lock);
1.80      yamt      167:        while (socurkva + len > somaxkva) {
1.93      yamt      168:                size_t freed;
                    169:
                    170:                /*
                    171:                 * try to do pendfree.
                    172:                 */
                    173:
1.117     yamt      174:                freed = sodopendfreel();
1.93      yamt      175:
                    176:                /*
                    177:                 * if some kva was freed, try again.
                    178:                 */
                    179:
                    180:                if (freed)
1.80      yamt      181:                        continue;
1.93      yamt      182:
1.80      yamt      183:                SOSEND_COUNTER_INCR(&sosend_kvalimit);
1.136     ad        184:                error = cv_wait_sig(&socurkva_cv, &so_pendfree_lock);
1.98      christos  185:                if (error) {
                    186:                        len = 0;
                    187:                        break;
                    188:                }
1.80      yamt      189:        }
1.93      yamt      190:        socurkva += len;
1.136     ad        191:        mutex_exit(&so_pendfree_lock);
1.98      christos  192:        return len;
1.95      yamt      193: }
                    194:
1.113     thorpej   195: static void
1.95      yamt      196: sokvaunreserve(vsize_t len)
                    197: {
                    198:
1.136     ad        199:        mutex_enter(&so_pendfree_lock);
1.95      yamt      200:        socurkva -= len;
1.136     ad        201:        cv_broadcast(&socurkva_cv);
                    202:        mutex_exit(&so_pendfree_lock);
1.95      yamt      203: }
                    204:
                    205: /*
                    206:  * sokvaalloc: allocate kva for loan.
                    207:  */
                    208:
                    209: vaddr_t
                    210: sokvaalloc(vsize_t len, struct socket *so)
                    211: {
                    212:        vaddr_t lva;
                    213:
                    214:        /*
                    215:         * reserve kva.
                    216:         */
                    217:
1.98      christos  218:        if (sokvareserve(so, len) == 0)
                    219:                return 0;
1.93      yamt      220:
                    221:        /*
                    222:         * allocate kva.
                    223:         */
1.80      yamt      224:
1.109     yamt      225:        lva = uvm_km_alloc(kernel_map, len, 0, UVM_KMF_VAONLY | UVM_KMF_WAITVA);
1.95      yamt      226:        if (lva == 0) {
                    227:                sokvaunreserve(len);
1.80      yamt      228:                return (0);
1.95      yamt      229:        }
1.80      yamt      230:
                    231:        return lva;
                    232: }
                    233:
1.93      yamt      234: /*
                    235:  * sokvafree: free kva for loan.
                    236:  */
                    237:
1.80      yamt      238: void
                    239: sokvafree(vaddr_t sva, vsize_t len)
                    240: {
1.93      yamt      241:
                    242:        /*
                    243:         * free kva.
                    244:         */
1.80      yamt      245:
1.109     yamt      246:        uvm_km_free(kernel_map, sva, len, UVM_KMF_VAONLY);
1.93      yamt      247:
                    248:        /*
                    249:         * unreserve kva.
                    250:         */
                    251:
1.95      yamt      252:        sokvaunreserve(len);
1.80      yamt      253: }
                    254:
1.64      thorpej   255: static void
1.134     christos  256: sodoloanfree(struct vm_page **pgs, void *buf, size_t size)
1.64      thorpej   257: {
1.156     yamt      258:        vaddr_t sva, eva;
1.64      thorpej   259:        vsize_t len;
1.156     yamt      260:        int npgs;
                    261:
                    262:        KASSERT(pgs != NULL);
1.64      thorpej   263:
                    264:        eva = round_page((vaddr_t) buf + size);
                    265:        sva = trunc_page((vaddr_t) buf);
                    266:        len = eva - sva;
                    267:        npgs = len >> PAGE_SHIFT;
                    268:
                    269:        pmap_kremove(sva, len);
                    270:        pmap_update(pmap_kernel());
                    271:        uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE);
1.80      yamt      272:        sokvafree(sva, len);
1.64      thorpej   273: }
                    274:
                    275: static size_t
1.152     matt      276: sodopendfree(void)
1.64      thorpej   277: {
1.93      yamt      278:        size_t rv;
1.64      thorpej   279:
1.136     ad        280:        mutex_enter(&so_pendfree_lock);
1.117     yamt      281:        rv = sodopendfreel();
1.136     ad        282:        mutex_exit(&so_pendfree_lock);
1.93      yamt      283:
                    284:        return rv;
                    285: }
                    286:
                    287: /*
                    288:  * sodopendfreel: free mbufs on "pendfree" list.
1.136     ad        289:  * unlock and relock so_pendfree_lock when freeing mbufs.
1.93      yamt      290:  *
1.136     ad        291:  * => called with so_pendfree_lock held.
1.93      yamt      292:  */
                    293:
                    294: static size_t
1.152     matt      295: sodopendfreel(void)
1.93      yamt      296: {
1.137     ad        297:        struct mbuf *m, *next;
1.93      yamt      298:        size_t rv = 0;
                    299:
1.136     ad        300:        KASSERT(mutex_owned(&so_pendfree_lock));
1.64      thorpej   301:
1.137     ad        302:        while (so_pendfree != NULL) {
1.64      thorpej   303:                m = so_pendfree;
1.93      yamt      304:                so_pendfree = NULL;
1.136     ad        305:                mutex_exit(&so_pendfree_lock);
1.93      yamt      306:
                    307:                for (; m != NULL; m = next) {
                    308:                        next = m->m_next;
1.156     yamt      309:                        KASSERT((~m->m_flags & (M_EXT|M_EXT_PAGES)) == 0);
                    310:                        KASSERT(m->m_ext.ext_refcnt == 0);
1.93      yamt      311:
                    312:                        rv += m->m_ext.ext_size;
1.156     yamt      313:                        sodoloanfree(m->m_ext.ext_pgs, m->m_ext.ext_buf,
1.93      yamt      314:                            m->m_ext.ext_size);
1.145     ad        315:                        pool_cache_put(mb_cache, m);
1.93      yamt      316:                }
1.64      thorpej   317:
1.136     ad        318:                mutex_enter(&so_pendfree_lock);
1.64      thorpej   319:        }
                    320:
                    321:        return (rv);
                    322: }
                    323:
1.80      yamt      324: void
1.134     christos  325: soloanfree(struct mbuf *m, void *buf, size_t size, void *arg)
1.64      thorpej   326: {
                    327:
1.156     yamt      328:        KASSERT(m != NULL);
1.64      thorpej   329:
1.93      yamt      330:        /*
                    331:         * postpone freeing mbuf.
                    332:         *
                    333:         * we can't do it in interrupt context
                    334:         * because we need to put kva back to kernel_map.
                    335:         */
                    336:
1.136     ad        337:        mutex_enter(&so_pendfree_lock);
1.92      yamt      338:        m->m_next = so_pendfree;
                    339:        so_pendfree = m;
1.136     ad        340:        cv_broadcast(&socurkva_cv);
                    341:        mutex_exit(&so_pendfree_lock);
1.64      thorpej   342: }
                    343:
                    344: static long
                    345: sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space)
                    346: {
                    347:        struct iovec *iov = uio->uio_iov;
                    348:        vaddr_t sva, eva;
                    349:        vsize_t len;
1.156     yamt      350:        vaddr_t lva;
                    351:        int npgs, error;
                    352:        vaddr_t va;
                    353:        int i;
1.64      thorpej   354:
1.116     yamt      355:        if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace))
1.64      thorpej   356:                return (0);
                    357:
                    358:        if (iov->iov_len < (size_t) space)
                    359:                space = iov->iov_len;
                    360:        if (space > SOCK_LOAN_CHUNK)
                    361:                space = SOCK_LOAN_CHUNK;
                    362:
                    363:        eva = round_page((vaddr_t) iov->iov_base + space);
                    364:        sva = trunc_page((vaddr_t) iov->iov_base);
                    365:        len = eva - sva;
                    366:        npgs = len >> PAGE_SHIFT;
                    367:
1.79      thorpej   368:        /* XXX KDASSERT */
                    369:        KASSERT(npgs <= M_EXT_MAXPAGES);
                    370:
1.80      yamt      371:        lva = sokvaalloc(len, so);
1.64      thorpej   372:        if (lva == 0)
1.80      yamt      373:                return 0;
1.64      thorpej   374:
1.116     yamt      375:        error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len,
1.79      thorpej   376:            m->m_ext.ext_pgs, UVM_LOAN_TOPAGE);
1.64      thorpej   377:        if (error) {
1.80      yamt      378:                sokvafree(lva, len);
1.64      thorpej   379:                return (0);
                    380:        }
                    381:
                    382:        for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE)
1.79      thorpej   383:                pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]),
                    384:                    VM_PROT_READ);
1.64      thorpej   385:        pmap_update(pmap_kernel());
                    386:
                    387:        lva += (vaddr_t) iov->iov_base & PAGE_MASK;
                    388:
1.134     christos  389:        MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so);
1.79      thorpej   390:        m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP;
1.64      thorpej   391:
                    392:        uio->uio_resid -= space;
                    393:        /* uio_offset not updated, not set/used for write(2) */
1.134     christos  394:        uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space;
1.64      thorpej   395:        uio->uio_iov->iov_len -= space;
                    396:        if (uio->uio_iov->iov_len == 0) {
                    397:                uio->uio_iov++;
                    398:                uio->uio_iovcnt--;
                    399:        }
                    400:
                    401:        return (space);
                    402: }
                    403:
1.119     yamt      404: static int
1.129     yamt      405: sokva_reclaim_callback(struct callback_entry *ce, void *obj, void *arg)
1.119     yamt      406: {
                    407:
                    408:        KASSERT(ce == &sokva_reclaimerentry);
                    409:        KASSERT(obj == NULL);
                    410:
                    411:        sodopendfree();
                    412:        if (!vm_map_starved_p(kernel_map)) {
                    413:                return CALLBACK_CHAIN_ABORT;
                    414:        }
                    415:        return CALLBACK_CHAIN_CONTINUE;
                    416: }
                    417:
1.142     dyoung    418: struct mbuf *
1.147     dyoung    419: getsombuf(struct socket *so, int type)
1.142     dyoung    420: {
                    421:        struct mbuf *m;
                    422:
1.147     dyoung    423:        m = m_get(M_WAIT, type);
1.142     dyoung    424:        MCLAIM(m, so->so_mowner);
                    425:        return m;
                    426: }
                    427:
                    428: struct mbuf *
                    429: m_intopt(struct socket *so, int val)
                    430: {
                    431:        struct mbuf *m;
                    432:
1.147     dyoung    433:        m = getsombuf(so, MT_SOOPTS);
1.142     dyoung    434:        m->m_len = sizeof(int);
                    435:        *mtod(m, int *) = val;
                    436:        return m;
                    437: }
                    438:
1.119     yamt      439: void
                    440: soinit(void)
                    441: {
                    442:
1.148     ad        443:        mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM);
1.136     ad        444:        cv_init(&socurkva_cv, "sokva");
                    445:
1.119     yamt      446:        /* Set the initial adjusted socket buffer size. */
                    447:        if (sb_max_set(sb_max))
                    448:                panic("bad initial sb_max value: %lu", sb_max);
                    449:
                    450:        callback_register(&vm_map_to_kernel(kernel_map)->vmk_reclaim_callback,
                    451:            &sokva_reclaimerentry, NULL, sokva_reclaim_callback);
                    452: }
                    453:
1.1       cgd       454: /*
                    455:  * Socket operation routines.
                    456:  * These routines are called by the routines in
                    457:  * sys_socket.c or from a system process, and
                    458:  * implement the semantics of socket operations by
                    459:  * switching out to the protocol specific routines.
                    460:  */
                    461: /*ARGSUSED*/
1.3       andrew    462: int
1.114     christos  463: socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l)
1.1       cgd       464: {
1.99      matt      465:        const struct protosw    *prp;
1.54      lukem     466:        struct socket   *so;
1.115     yamt      467:        uid_t           uid;
1.54      lukem     468:        int             error, s;
1.1       cgd       469:
1.132     elad      470:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET,
                    471:            KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type),
                    472:            KAUTH_ARG(proto));
1.140     dyoung    473:        if (error != 0)
                    474:                return error;
1.127     elad      475:
1.1       cgd       476:        if (proto)
                    477:                prp = pffindproto(dom, proto, type);
                    478:        else
                    479:                prp = pffindtype(dom, type);
1.140     dyoung    480:        if (prp == NULL) {
1.120     ginsbach  481:                /* no support for domain */
                    482:                if (pffinddomain(dom) == 0)
1.140     dyoung    483:                        return EAFNOSUPPORT;
1.120     ginsbach  484:                /* no support for socket type */
                    485:                if (proto == 0 && type != 0)
1.140     dyoung    486:                        return EPROTOTYPE;
                    487:                return EPROTONOSUPPORT;
1.120     ginsbach  488:        }
1.140     dyoung    489:        if (prp->pr_usrreq == NULL)
                    490:                return EPROTONOSUPPORT;
1.1       cgd       491:        if (prp->pr_type != type)
1.140     dyoung    492:                return EPROTOTYPE;
1.39      matt      493:        s = splsoftnet();
1.37      thorpej   494:        so = pool_get(&socket_pool, PR_WAITOK);
1.140     dyoung    495:        memset(so, 0, sizeof(*so));
1.31      thorpej   496:        TAILQ_INIT(&so->so_q0);
                    497:        TAILQ_INIT(&so->so_q);
1.1       cgd       498:        so->so_type = type;
                    499:        so->so_proto = prp;
1.33      matt      500:        so->so_send = sosend;
                    501:        so->so_receive = soreceive;
1.78      matt      502: #ifdef MBUFTRACE
                    503:        so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner;
                    504:        so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner;
                    505:        so->so_mowner = &prp->pr_domain->dom_mowner;
                    506: #endif
1.143     ad        507:        selinit(&so->so_rcv.sb_sel);
                    508:        selinit(&so->so_snd.sb_sel);
1.138     rmind     509:        uid = kauth_cred_geteuid(l->l_cred);
1.115     yamt      510:        so->so_uidinfo = uid_find(uid);
1.140     dyoung    511:        error = (*prp->pr_usrreq)(so, PRU_ATTACH, NULL,
                    512:            (struct mbuf *)(long)proto, NULL, l);
                    513:        if (error != 0) {
1.1       cgd       514:                so->so_state |= SS_NOFDREF;
                    515:                sofree(so);
1.39      matt      516:                splx(s);
1.140     dyoung    517:                return error;
1.1       cgd       518:        }
1.39      matt      519:        splx(s);
1.1       cgd       520:        *aso = so;
1.140     dyoung    521:        return 0;
1.1       cgd       522: }
                    523:
1.142     dyoung    524: /* On success, write file descriptor to fdout and return zero.  On
                    525:  * failure, return non-zero; *fdout will be undefined.
                    526:  */
                    527: int
                    528: fsocreate(int domain, struct socket **sop, int type, int protocol,
                    529:     struct lwp *l, int *fdout)
                    530: {
                    531:        struct socket   *so;
                    532:        struct file     *fp;
                    533:        int             fd, error;
                    534:
1.155     ad        535:        if ((error = fd_allocfile(&fp, &fd)) != 0)
1.142     dyoung    536:                return (error);
                    537:        fp->f_flag = FREAD|FWRITE;
                    538:        fp->f_type = DTYPE_SOCKET;
                    539:        fp->f_ops = &socketops;
                    540:        error = socreate(domain, &so, type, protocol, l);
                    541:        if (error != 0) {
1.155     ad        542:                fd_abort(curproc, fp, fd);
1.142     dyoung    543:        } else {
                    544:                if (sop != NULL)
                    545:                        *sop = so;
                    546:                fp->f_data = so;
1.155     ad        547:                fd_affix(curproc, fp, fd);
1.142     dyoung    548:                *fdout = fd;
                    549:        }
                    550:        return error;
                    551: }
                    552:
1.3       andrew    553: int
1.114     christos  554: sobind(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1       cgd       555: {
1.54      lukem     556:        int     s, error;
1.1       cgd       557:
1.54      lukem     558:        s = splsoftnet();
1.140     dyoung    559:        error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, NULL, nam, NULL, l);
1.1       cgd       560:        splx(s);
1.140     dyoung    561:        return error;
1.1       cgd       562: }
                    563:
1.3       andrew    564: int
1.150     elad      565: solisten(struct socket *so, int backlog, struct lwp *l)
1.1       cgd       566: {
1.54      lukem     567:        int     s, error;
1.1       cgd       568:
1.54      lukem     569:        s = splsoftnet();
1.158     ad        570:        if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
                    571:            SS_ISDISCONNECTING)) != 0)
                    572:                return (EOPNOTSUPP);
1.140     dyoung    573:        error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, NULL,
1.150     elad      574:            NULL, NULL, l);
1.140     dyoung    575:        if (error != 0) {
1.1       cgd       576:                splx(s);
1.140     dyoung    577:                return error;
1.1       cgd       578:        }
1.63      matt      579:        if (TAILQ_EMPTY(&so->so_q))
1.1       cgd       580:                so->so_options |= SO_ACCEPTCONN;
                    581:        if (backlog < 0)
                    582:                backlog = 0;
1.49      jonathan  583:        so->so_qlimit = min(backlog, somaxconn);
1.1       cgd       584:        splx(s);
1.140     dyoung    585:        return 0;
1.1       cgd       586: }
                    587:
1.21      christos  588: void
1.54      lukem     589: sofree(struct socket *so)
1.1       cgd       590: {
                    591:
1.43      mycroft   592:        if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0)
1.1       cgd       593:                return;
1.43      mycroft   594:        if (so->so_head) {
                    595:                /*
                    596:                 * We must not decommission a socket that's on the accept(2)
                    597:                 * queue.  If we do, then accept(2) may hang after select(2)
                    598:                 * indicated that the listening socket was ready.
                    599:                 */
                    600:                if (!soqremque(so, 0))
                    601:                        return;
                    602:        }
1.98      christos  603:        if (so->so_rcv.sb_hiwat)
1.110     christos  604:                (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98      christos  605:                    RLIM_INFINITY);
                    606:        if (so->so_snd.sb_hiwat)
1.110     christos  607:                (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98      christos  608:                    RLIM_INFINITY);
                    609:        sbrelease(&so->so_snd, so);
1.1       cgd       610:        sorflush(so);
1.143     ad        611:        seldestroy(&so->so_rcv.sb_sel);
                    612:        seldestroy(&so->so_snd.sb_sel);
1.37      thorpej   613:        pool_put(&socket_pool, so);
1.1       cgd       614: }
                    615:
                    616: /*
                    617:  * Close a socket on last file table reference removal.
                    618:  * Initiate disconnect if connected.
                    619:  * Free socket when disconnect complete.
                    620:  */
1.3       andrew    621: int
1.54      lukem     622: soclose(struct socket *so)
1.1       cgd       623: {
1.54      lukem     624:        struct socket   *so2;
                    625:        int             s, error;
1.1       cgd       626:
1.54      lukem     627:        error = 0;
                    628:        s = splsoftnet();               /* conservative */
1.1       cgd       629:        if (so->so_options & SO_ACCEPTCONN) {
1.63      matt      630:                while ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.42      mycroft   631:                        (void) soqremque(so2, 0);
1.41      mycroft   632:                        (void) soabort(so2);
                    633:                }
1.63      matt      634:                while ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.42      mycroft   635:                        (void) soqremque(so2, 1);
1.41      mycroft   636:                        (void) soabort(so2);
                    637:                }
1.1       cgd       638:        }
                    639:        if (so->so_pcb == 0)
                    640:                goto discard;
                    641:        if (so->so_state & SS_ISCONNECTED) {
                    642:                if ((so->so_state & SS_ISDISCONNECTING) == 0) {
                    643:                        error = sodisconnect(so);
                    644:                        if (error)
                    645:                                goto drop;
                    646:                }
                    647:                if (so->so_options & SO_LINGER) {
1.151     ad        648:                        if ((so->so_state & SS_ISDISCONNECTING) && so->so_nbio)
1.1       cgd       649:                                goto drop;
1.21      christos  650:                        while (so->so_state & SS_ISCONNECTED) {
1.134     christos  651:                                error = tsleep((void *)&so->so_timeo,
1.21      christos  652:                                               PSOCK | PCATCH, netcls,
1.30      thorpej   653:                                               so->so_linger * hz);
1.21      christos  654:                                if (error)
1.1       cgd       655:                                        break;
1.21      christos  656:                        }
1.1       cgd       657:                }
                    658:        }
1.54      lukem     659:  drop:
1.1       cgd       660:        if (so->so_pcb) {
1.22      mycroft   661:                int error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
1.140     dyoung    662:                    NULL, NULL, NULL, NULL);
1.1       cgd       663:                if (error == 0)
                    664:                        error = error2;
                    665:        }
1.54      lukem     666:  discard:
1.1       cgd       667:        if (so->so_state & SS_NOFDREF)
                    668:                panic("soclose: NOFDREF");
                    669:        so->so_state |= SS_NOFDREF;
                    670:        sofree(so);
                    671:        splx(s);
                    672:        return (error);
                    673: }
                    674:
                    675: /*
1.20      mycroft   676:  * Must be called at splsoftnet...
1.1       cgd       677:  */
1.3       andrew    678: int
1.54      lukem     679: soabort(struct socket *so)
1.1       cgd       680: {
1.139     yamt      681:        int error;
1.1       cgd       682:
1.139     yamt      683:        KASSERT(so->so_head == NULL);
1.140     dyoung    684:        error = (*so->so_proto->pr_usrreq)(so, PRU_ABORT, NULL,
                    685:            NULL, NULL, NULL);
1.139     yamt      686:        if (error) {
                    687:                sofree(so);
                    688:        }
                    689:        return error;
1.1       cgd       690: }
                    691:
1.3       andrew    692: int
1.54      lukem     693: soaccept(struct socket *so, struct mbuf *nam)
1.1       cgd       694: {
1.54      lukem     695:        int     s, error;
1.1       cgd       696:
1.54      lukem     697:        error = 0;
                    698:        s = splsoftnet();
1.1       cgd       699:        if ((so->so_state & SS_NOFDREF) == 0)
                    700:                panic("soaccept: !NOFDREF");
                    701:        so->so_state &= ~SS_NOFDREF;
1.55      thorpej   702:        if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
                    703:            (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.41      mycroft   704:                error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT,
1.140     dyoung    705:                    NULL, nam, NULL, NULL);
1.41      mycroft   706:        else
1.53      itojun    707:                error = ECONNABORTED;
1.52      itojun    708:
1.1       cgd       709:        splx(s);
                    710:        return (error);
                    711: }
                    712:
1.3       andrew    713: int
1.114     christos  714: soconnect(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1       cgd       715: {
1.54      lukem     716:        int             s, error;
1.1       cgd       717:
                    718:        if (so->so_options & SO_ACCEPTCONN)
                    719:                return (EOPNOTSUPP);
1.20      mycroft   720:        s = splsoftnet();
1.1       cgd       721:        /*
                    722:         * If protocol is connection-based, can only connect once.
                    723:         * Otherwise, if connected, try to disconnect first.
                    724:         * This allows user to disconnect by connecting to, e.g.,
                    725:         * a null address.
                    726:         */
                    727:        if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
                    728:            ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
                    729:            (error = sodisconnect(so))))
                    730:                error = EISCONN;
                    731:        else
                    732:                error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
1.140     dyoung    733:                    NULL, nam, NULL, l);
1.1       cgd       734:        splx(s);
                    735:        return (error);
                    736: }
                    737:
1.3       andrew    738: int
1.54      lukem     739: soconnect2(struct socket *so1, struct socket *so2)
1.1       cgd       740: {
1.54      lukem     741:        int     s, error;
1.1       cgd       742:
1.54      lukem     743:        s = splsoftnet();
1.22      mycroft   744:        error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
1.140     dyoung    745:            NULL, (struct mbuf *)so2, NULL, NULL);
1.1       cgd       746:        splx(s);
                    747:        return (error);
                    748: }
                    749:
1.3       andrew    750: int
1.54      lukem     751: sodisconnect(struct socket *so)
1.1       cgd       752: {
1.54      lukem     753:        int     s, error;
1.1       cgd       754:
1.54      lukem     755:        s = splsoftnet();
1.1       cgd       756:        if ((so->so_state & SS_ISCONNECTED) == 0) {
                    757:                error = ENOTCONN;
                    758:                goto bad;
                    759:        }
                    760:        if (so->so_state & SS_ISDISCONNECTING) {
                    761:                error = EALREADY;
                    762:                goto bad;
                    763:        }
1.22      mycroft   764:        error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
1.140     dyoung    765:            NULL, NULL, NULL, NULL);
1.54      lukem     766:  bad:
1.1       cgd       767:        splx(s);
1.117     yamt      768:        sodopendfree();
1.1       cgd       769:        return (error);
                    770: }
                    771:
1.15      mycroft   772: #define        SBLOCKWAIT(f)   (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1       cgd       773: /*
                    774:  * Send on a socket.
                    775:  * If send must go all at once and message is larger than
                    776:  * send buffering, then hard error.
                    777:  * Lock against other senders.
                    778:  * If must go all at once and not enough room now, then
                    779:  * inform user that this would block and do nothing.
                    780:  * Otherwise, if nonblocking, send as much as possible.
                    781:  * The data to be sent is described by "uio" if nonzero,
                    782:  * otherwise by the mbuf chain "top" (which must be null
                    783:  * if uio is not).  Data provided in mbuf chain must be small
                    784:  * enough to send all at once.
                    785:  *
                    786:  * Returns nonzero on error, timeout or signal; callers
                    787:  * must check for short counts if EINTR/ERESTART are returned.
                    788:  * Data and control buffers are freed on return.
                    789:  */
1.3       andrew    790: int
1.54      lukem     791: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
1.114     christos  792:        struct mbuf *control, int flags, struct lwp *l)
1.1       cgd       793: {
1.54      lukem     794:        struct mbuf     **mp, *m;
1.114     christos  795:        struct proc     *p;
1.58      jdolecek  796:        long            space, len, resid, clen, mlen;
                    797:        int             error, s, dontroute, atomic;
1.54      lukem     798:
1.114     christos  799:        p = l->l_proc;
1.117     yamt      800:        sodopendfree();
1.64      thorpej   801:
1.54      lukem     802:        clen = 0;
                    803:        atomic = sosendallatonce(so) || top;
1.1       cgd       804:        if (uio)
                    805:                resid = uio->uio_resid;
                    806:        else
                    807:                resid = top->m_pkthdr.len;
1.7       cgd       808:        /*
                    809:         * In theory resid should be unsigned.
                    810:         * However, space must be signed, as it might be less than 0
                    811:         * if we over-committed, and we must use a signed comparison
                    812:         * of space and resid.  On the other hand, a negative resid
                    813:         * causes us to loop sending 0-length segments to the protocol.
                    814:         */
1.29      mycroft   815:        if (resid < 0) {
                    816:                error = EINVAL;
                    817:                goto out;
                    818:        }
1.1       cgd       819:        dontroute =
                    820:            (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
                    821:            (so->so_proto->pr_flags & PR_ATOMIC);
1.157     ad        822:        if (l)
                    823:                l->l_ru.ru_msgsnd++;
1.1       cgd       824:        if (control)
                    825:                clen = control->m_len;
                    826: #define        snderr(errno)   { error = errno; splx(s); goto release; }
                    827:
1.54      lukem     828:  restart:
1.21      christos  829:        if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1       cgd       830:                goto out;
                    831:        do {
1.20      mycroft   832:                s = splsoftnet();
1.1       cgd       833:                if (so->so_state & SS_CANTSENDMORE)
                    834:                        snderr(EPIPE);
1.48      thorpej   835:                if (so->so_error) {
                    836:                        error = so->so_error;
                    837:                        so->so_error = 0;
                    838:                        splx(s);
                    839:                        goto release;
                    840:                }
1.1       cgd       841:                if ((so->so_state & SS_ISCONNECTED) == 0) {
                    842:                        if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
                    843:                                if ((so->so_state & SS_ISCONFIRMING) == 0 &&
                    844:                                    !(resid == 0 && clen != 0))
                    845:                                        snderr(ENOTCONN);
                    846:                        } else if (addr == 0)
                    847:                                snderr(EDESTADDRREQ);
                    848:                }
                    849:                space = sbspace(&so->so_snd);
                    850:                if (flags & MSG_OOB)
                    851:                        space += 1024;
1.21      christos  852:                if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.11      mycroft   853:                    clen > so->so_snd.sb_hiwat)
                    854:                        snderr(EMSGSIZE);
1.96      mycroft   855:                if (space < resid + clen &&
1.1       cgd       856:                    (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.151     ad        857:                        if (so->so_nbio)
1.1       cgd       858:                                snderr(EWOULDBLOCK);
                    859:                        sbunlock(&so->so_snd);
                    860:                        error = sbwait(&so->so_snd);
                    861:                        splx(s);
                    862:                        if (error)
                    863:                                goto out;
                    864:                        goto restart;
                    865:                }
                    866:                splx(s);
                    867:                mp = &top;
                    868:                space -= clen;
                    869:                do {
1.45      tv        870:                        if (uio == NULL) {
                    871:                                /*
                    872:                                 * Data is prepackaged in "top".
                    873:                                 */
                    874:                                resid = 0;
                    875:                                if (flags & MSG_EOR)
                    876:                                        top->m_flags |= M_EOR;
                    877:                        } else do {
1.144     dyoung    878:                                if (top == NULL) {
1.78      matt      879:                                        m = m_gethdr(M_WAIT, MT_DATA);
1.45      tv        880:                                        mlen = MHLEN;
                    881:                                        m->m_pkthdr.len = 0;
1.140     dyoung    882:                                        m->m_pkthdr.rcvif = NULL;
1.45      tv        883:                                } else {
1.78      matt      884:                                        m = m_get(M_WAIT, MT_DATA);
1.45      tv        885:                                        mlen = MLEN;
                    886:                                }
1.78      matt      887:                                MCLAIM(m, so->so_snd.sb_mowner);
1.121     yamt      888:                                if (sock_loan_thresh >= 0 &&
                    889:                                    uio->uio_iov->iov_len >= sock_loan_thresh &&
                    890:                                    space >= sock_loan_thresh &&
1.64      thorpej   891:                                    (len = sosend_loan(so, uio, m,
                    892:                                                       space)) != 0) {
                    893:                                        SOSEND_COUNTER_INCR(&sosend_loan_big);
                    894:                                        space -= len;
                    895:                                        goto have_data;
                    896:                                }
1.45      tv        897:                                if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64      thorpej   898:                                        SOSEND_COUNTER_INCR(&sosend_copy_big);
1.78      matt      899:                                        m_clget(m, M_WAIT);
1.45      tv        900:                                        if ((m->m_flags & M_EXT) == 0)
                    901:                                                goto nopages;
                    902:                                        mlen = MCLBYTES;
                    903:                                        if (atomic && top == 0) {
1.58      jdolecek  904:                                                len = lmin(MCLBYTES - max_hdr,
1.54      lukem     905:                                                    resid);
1.45      tv        906:                                                m->m_data += max_hdr;
                    907:                                        } else
1.58      jdolecek  908:                                                len = lmin(MCLBYTES, resid);
1.45      tv        909:                                        space -= len;
                    910:                                } else {
1.64      thorpej   911:  nopages:
                    912:                                        SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58      jdolecek  913:                                        len = lmin(lmin(mlen, resid), space);
1.45      tv        914:                                        space -= len;
                    915:                                        /*
                    916:                                         * For datagram protocols, leave room
                    917:                                         * for protocol headers in first mbuf.
                    918:                                         */
                    919:                                        if (atomic && top == 0 && len < mlen)
                    920:                                                MH_ALIGN(m, len);
                    921:                                }
1.144     dyoung    922:                                error = uiomove(mtod(m, void *), (int)len, uio);
1.64      thorpej   923:  have_data:
1.45      tv        924:                                resid = uio->uio_resid;
                    925:                                m->m_len = len;
                    926:                                *mp = m;
                    927:                                top->m_pkthdr.len += len;
1.144     dyoung    928:                                if (error != 0)
1.45      tv        929:                                        goto release;
                    930:                                mp = &m->m_next;
                    931:                                if (resid <= 0) {
                    932:                                        if (flags & MSG_EOR)
                    933:                                                top->m_flags |= M_EOR;
                    934:                                        break;
                    935:                                }
                    936:                        } while (space > 0 && atomic);
1.108     perry     937:
1.46      sommerfe  938:                        s = splsoftnet();
                    939:
                    940:                        if (so->so_state & SS_CANTSENDMORE)
                    941:                                snderr(EPIPE);
1.45      tv        942:
                    943:                        if (dontroute)
                    944:                                so->so_options |= SO_DONTROUTE;
                    945:                        if (resid > 0)
                    946:                                so->so_state |= SS_MORETOCOME;
1.46      sommerfe  947:                        error = (*so->so_proto->pr_usrreq)(so,
                    948:                            (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
1.114     christos  949:                            top, addr, control, curlwp);        /* XXX */
1.45      tv        950:                        if (dontroute)
                    951:                                so->so_options &= ~SO_DONTROUTE;
                    952:                        if (resid > 0)
                    953:                                so->so_state &= ~SS_MORETOCOME;
1.46      sommerfe  954:                        splx(s);
                    955:
1.45      tv        956:                        clen = 0;
1.144     dyoung    957:                        control = NULL;
                    958:                        top = NULL;
1.45      tv        959:                        mp = &top;
1.144     dyoung    960:                        if (error != 0)
1.1       cgd       961:                                goto release;
                    962:                } while (resid && space > 0);
                    963:        } while (resid);
                    964:
1.54      lukem     965:  release:
1.1       cgd       966:        sbunlock(&so->so_snd);
1.54      lukem     967:  out:
1.1       cgd       968:        if (top)
                    969:                m_freem(top);
                    970:        if (control)
                    971:                m_freem(control);
                    972:        return (error);
                    973: }
                    974:
                    975: /*
1.159   ! ad        976:  * Following replacement or removal of the first mbuf on the first
        !           977:  * mbuf chain of a socket buffer, push necessary state changes back
        !           978:  * into the socket buffer so that other consumers see the values
        !           979:  * consistently.  'nextrecord' is the callers locally stored value of
        !           980:  * the original value of sb->sb_mb->m_nextpkt which must be restored
        !           981:  * when the lead mbuf changes.  NOTE: 'nextrecord' may be NULL.
        !           982:  */
        !           983: static void
        !           984: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
        !           985: {
        !           986:
        !           987:        /*
        !           988:         * First, update for the new value of nextrecord.  If necessary,
        !           989:         * make it the first record.
        !           990:         */
        !           991:        if (sb->sb_mb != NULL)
        !           992:                sb->sb_mb->m_nextpkt = nextrecord;
        !           993:        else
        !           994:                sb->sb_mb = nextrecord;
        !           995:
        !           996:         /*
        !           997:          * Now update any dependent socket buffer fields to reflect
        !           998:          * the new state.  This is an inline of SB_EMPTY_FIXUP, with
        !           999:          * the addition of a second clause that takes care of the
        !          1000:          * case where sb_mb has been updated, but remains the last
        !          1001:          * record.
        !          1002:          */
        !          1003:         if (sb->sb_mb == NULL) {
        !          1004:                 sb->sb_mbtail = NULL;
        !          1005:                 sb->sb_lastrecord = NULL;
        !          1006:         } else if (sb->sb_mb->m_nextpkt == NULL)
        !          1007:                 sb->sb_lastrecord = sb->sb_mb;
        !          1008: }
        !          1009:
        !          1010: /*
1.1       cgd      1011:  * Implement receive operations on a socket.
                   1012:  * We depend on the way that records are added to the sockbuf
                   1013:  * by sbappend*.  In particular, each record (mbufs linked through m_next)
                   1014:  * must begin with an address if the protocol so specifies,
                   1015:  * followed by an optional mbuf or mbufs containing ancillary data,
                   1016:  * and then zero or more mbufs of data.
                   1017:  * In order to avoid blocking network interrupts for the entire time here,
                   1018:  * we splx() while doing the actual copy to user space.
                   1019:  * Although the sockbuf is locked, new data may still be appended,
                   1020:  * and thus we must maintain consistency of the sockbuf during that time.
                   1021:  *
                   1022:  * The caller may receive the data as a single mbuf chain by supplying
                   1023:  * an mbuf **mp0 for use in returning the chain.  The uio is then used
                   1024:  * only for the count in uio_resid.
                   1025:  */
1.3       andrew   1026: int
1.54      lukem    1027: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
                   1028:        struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1       cgd      1029: {
1.116     yamt     1030:        struct lwp *l = curlwp;
1.54      lukem    1031:        struct mbuf     *m, **mp;
1.146     dyoung   1032:        int atomic, flags, len, error, s, offset, moff, type, orig_resid;
1.99      matt     1033:        const struct protosw    *pr;
1.54      lukem    1034:        struct mbuf     *nextrecord;
1.67      he       1035:        int             mbuf_removed = 0;
1.146     dyoung   1036:        const struct domain *dom;
1.64      thorpej  1037:
1.54      lukem    1038:        pr = so->so_proto;
1.146     dyoung   1039:        atomic = pr->pr_flags & PR_ATOMIC;
                   1040:        dom = pr->pr_domain;
1.1       cgd      1041:        mp = mp0;
1.54      lukem    1042:        type = 0;
                   1043:        orig_resid = uio->uio_resid;
1.102     jonathan 1044:
1.144     dyoung   1045:        if (paddr != NULL)
                   1046:                *paddr = NULL;
                   1047:        if (controlp != NULL)
                   1048:                *controlp = NULL;
                   1049:        if (flagsp != NULL)
1.1       cgd      1050:                flags = *flagsp &~ MSG_EOR;
                   1051:        else
                   1052:                flags = 0;
1.66      enami    1053:
                   1054:        if ((flags & MSG_DONTWAIT) == 0)
1.117     yamt     1055:                sodopendfree();
1.66      enami    1056:
1.1       cgd      1057:        if (flags & MSG_OOB) {
                   1058:                m = m_get(M_WAIT, MT_DATA);
1.17      cgd      1059:                error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
1.140     dyoung   1060:                    (struct mbuf *)(long)(flags & MSG_PEEK), NULL, l);
1.1       cgd      1061:                if (error)
                   1062:                        goto bad;
                   1063:                do {
1.134     christos 1064:                        error = uiomove(mtod(m, void *),
1.1       cgd      1065:                            (int) min(uio->uio_resid, m->m_len), uio);
                   1066:                        m = m_free(m);
1.144     dyoung   1067:                } while (uio->uio_resid > 0 && error == 0 && m);
1.54      lukem    1068:  bad:
1.144     dyoung   1069:                if (m != NULL)
1.1       cgd      1070:                        m_freem(m);
1.144     dyoung   1071:                return error;
1.1       cgd      1072:        }
1.144     dyoung   1073:        if (mp != NULL)
1.140     dyoung   1074:                *mp = NULL;
1.1       cgd      1075:        if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
1.140     dyoung   1076:                (*pr->pr_usrreq)(so, PRU_RCVD, NULL, NULL, NULL, l);
1.1       cgd      1077:
1.54      lukem    1078:  restart:
1.21      christos 1079:        if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0)
1.144     dyoung   1080:                return error;
1.20      mycroft  1081:        s = splsoftnet();
1.1       cgd      1082:
                   1083:        m = so->so_rcv.sb_mb;
                   1084:        /*
                   1085:         * If we have less data than requested, block awaiting more
                   1086:         * (subject to any timeout) if:
1.15      mycroft  1087:         *   1. the current count is less than the low water mark,
1.1       cgd      1088:         *   2. MSG_WAITALL is set, and it is possible to do the entire
1.15      mycroft  1089:         *      receive operation at once if we block (resid <= hiwat), or
                   1090:         *   3. MSG_DONTWAIT is not set.
1.1       cgd      1091:         * If MSG_WAITALL is set but resid is larger than the receive buffer,
                   1092:         * we have to do the receive in sections, and thus risk returning
                   1093:         * a short count if a timeout or signal occurs after we start.
                   1094:         */
1.144     dyoung   1095:        if (m == NULL ||
                   1096:            ((flags & MSG_DONTWAIT) == 0 &&
                   1097:             so->so_rcv.sb_cc < uio->uio_resid &&
                   1098:             (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
                   1099:              ((flags & MSG_WAITALL) &&
                   1100:               uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146     dyoung   1101:             m->m_nextpkt == NULL && !atomic)) {
1.1       cgd      1102: #ifdef DIAGNOSTIC
1.144     dyoung   1103:                if (m == NULL && so->so_rcv.sb_cc)
1.1       cgd      1104:                        panic("receive 1");
                   1105: #endif
                   1106:                if (so->so_error) {
1.144     dyoung   1107:                        if (m != NULL)
1.15      mycroft  1108:                                goto dontblock;
1.1       cgd      1109:                        error = so->so_error;
                   1110:                        if ((flags & MSG_PEEK) == 0)
                   1111:                                so->so_error = 0;
                   1112:                        goto release;
                   1113:                }
                   1114:                if (so->so_state & SS_CANTRCVMORE) {
1.144     dyoung   1115:                        if (m != NULL)
1.15      mycroft  1116:                                goto dontblock;
1.1       cgd      1117:                        else
                   1118:                                goto release;
                   1119:                }
1.144     dyoung   1120:                for (; m != NULL; m = m->m_next)
1.1       cgd      1121:                        if (m->m_type == MT_OOBDATA  || (m->m_flags & M_EOR)) {
                   1122:                                m = so->so_rcv.sb_mb;
                   1123:                                goto dontblock;
                   1124:                        }
                   1125:                if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
                   1126:                    (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
                   1127:                        error = ENOTCONN;
                   1128:                        goto release;
                   1129:                }
                   1130:                if (uio->uio_resid == 0)
                   1131:                        goto release;
1.151     ad       1132:                if (so->so_nbio || (flags & MSG_DONTWAIT)) {
1.1       cgd      1133:                        error = EWOULDBLOCK;
                   1134:                        goto release;
                   1135:                }
1.69      thorpej  1136:                SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
                   1137:                SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1       cgd      1138:                sbunlock(&so->so_rcv);
                   1139:                error = sbwait(&so->so_rcv);
                   1140:                splx(s);
1.144     dyoung   1141:                if (error != 0)
                   1142:                        return error;
1.1       cgd      1143:                goto restart;
                   1144:        }
1.54      lukem    1145:  dontblock:
1.69      thorpej  1146:        /*
                   1147:         * On entry here, m points to the first record of the socket buffer.
1.159   ! ad       1148:         * From this point onward, we maintain 'nextrecord' as a cache of the
        !          1149:         * pointer to the next record in the socket buffer.  We must keep the
        !          1150:         * various socket buffer pointers and local stack versions of the
        !          1151:         * pointers in sync, pushing out modifications before dropping the
        !          1152:         * IPL, and re-reading them when picking it up.
        !          1153:         *
        !          1154:         * Otherwise, we will race with the network stack appending new data
        !          1155:         * or records onto the socket buffer by using inconsistent/stale
        !          1156:         * versions of the field, possibly resulting in socket buffer
        !          1157:         * corruption.
        !          1158:         *
        !          1159:         * By holding the high-level sblock(), we prevent simultaneous
        !          1160:         * readers from pulling off the front of the socket buffer.
1.69      thorpej  1161:         */
1.144     dyoung   1162:        if (l != NULL)
1.157     ad       1163:                l->l_ru.ru_msgrcv++;
1.69      thorpej  1164:        KASSERT(m == so->so_rcv.sb_mb);
                   1165:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
                   1166:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1       cgd      1167:        nextrecord = m->m_nextpkt;
                   1168:        if (pr->pr_flags & PR_ADDR) {
                   1169: #ifdef DIAGNOSTIC
                   1170:                if (m->m_type != MT_SONAME)
                   1171:                        panic("receive 1a");
                   1172: #endif
1.3       andrew   1173:                orig_resid = 0;
1.1       cgd      1174:                if (flags & MSG_PEEK) {
                   1175:                        if (paddr)
                   1176:                                *paddr = m_copy(m, 0, m->m_len);
                   1177:                        m = m->m_next;
                   1178:                } else {
                   1179:                        sbfree(&so->so_rcv, m);
1.67      he       1180:                        mbuf_removed = 1;
1.144     dyoung   1181:                        if (paddr != NULL) {
1.1       cgd      1182:                                *paddr = m;
                   1183:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1184:                                m->m_next = NULL;
1.1       cgd      1185:                                m = so->so_rcv.sb_mb;
                   1186:                        } else {
                   1187:                                MFREE(m, so->so_rcv.sb_mb);
                   1188:                                m = so->so_rcv.sb_mb;
                   1189:                        }
1.159   ! ad       1190:                        sbsync(&so->so_rcv, nextrecord);
1.1       cgd      1191:                }
                   1192:        }
1.159   ! ad       1193:
        !          1194:        /*
        !          1195:         * Process one or more MT_CONTROL mbufs present before any data mbufs
        !          1196:         * in the first mbuf chain on the socket buffer.  If MSG_PEEK, we
        !          1197:         * just copy the data; if !MSG_PEEK, we call into the protocol to
        !          1198:         * perform externalization (or freeing if controlp == NULL).
        !          1199:         */
        !          1200:        if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
        !          1201:                struct mbuf *cm = NULL, *cmn;
        !          1202:                struct mbuf **cme = &cm;
        !          1203:
        !          1204:                do {
        !          1205:                        if (flags & MSG_PEEK) {
        !          1206:                                if (controlp != NULL) {
        !          1207:                                        *controlp = m_copy(m, 0, m->m_len);
        !          1208:                                        controlp = &(*controlp)->m_next;
        !          1209:                                }
        !          1210:                                m = m->m_next;
        !          1211:                        } else {
        !          1212:                                sbfree(&so->so_rcv, m);
1.1       cgd      1213:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1214:                                m->m_next = NULL;
1.159   ! ad       1215:                                *cme = m;
        !          1216:                                cme = &(*cme)->m_next;
1.1       cgd      1217:                                m = so->so_rcv.sb_mb;
1.159   ! ad       1218:                        }
        !          1219:                } while (m != NULL && m->m_type == MT_CONTROL);
        !          1220:                if ((flags & MSG_PEEK) == 0)
        !          1221:                        sbsync(&so->so_rcv, nextrecord);
        !          1222:                for (; cm != NULL; cm = cmn) {
        !          1223:                        cmn = cm->m_next;
        !          1224:                        cm->m_next = NULL;
        !          1225:                        type = mtod(cm, struct cmsghdr *)->cmsg_type;
        !          1226:                        if (controlp != NULL) {
        !          1227:                                if (dom->dom_externalize != NULL &&
        !          1228:                                    type == SCM_RIGHTS) {
        !          1229:                                        splx(s);
        !          1230:                                        error = (*dom->dom_externalize)(cm, l);
        !          1231:                                        s = splsoftnet();
        !          1232:                                }
        !          1233:                                *controlp = cm;
        !          1234:                                while (*controlp != NULL)
        !          1235:                                        controlp = &(*controlp)->m_next;
1.1       cgd      1236:                        } else {
1.106     itojun   1237:                                /*
                   1238:                                 * Dispose of any SCM_RIGHTS message that went
                   1239:                                 * through the read path rather than recv.
                   1240:                                 */
1.159   ! ad       1241:                                if (dom->dom_dispose != NULL &&
        !          1242:                                    type == SCM_RIGHTS) {
        !          1243:                                        splx(s);
        !          1244:                                        (*dom->dom_dispose)(cm);
        !          1245:                                        s = splsoftnet();
        !          1246:                                }
        !          1247:                                m_freem(cm);
1.1       cgd      1248:                        }
                   1249:                }
1.159   ! ad       1250:                if (m != NULL)
        !          1251:                        nextrecord = so->so_rcv.sb_mb->m_nextpkt;
        !          1252:                else
        !          1253:                        nextrecord = so->so_rcv.sb_mb;
        !          1254:                orig_resid = 0;
1.1       cgd      1255:        }
1.69      thorpej  1256:
1.159   ! ad       1257:        /* If m is non-NULL, we have some data to read. */
        !          1258:        if (__predict_true(m != NULL)) {
1.1       cgd      1259:                type = m->m_type;
                   1260:                if (type == MT_OOBDATA)
                   1261:                        flags |= MSG_OOB;
                   1262:        }
1.69      thorpej  1263:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
                   1264:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
                   1265:
1.1       cgd      1266:        moff = 0;
                   1267:        offset = 0;
1.144     dyoung   1268:        while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1       cgd      1269:                if (m->m_type == MT_OOBDATA) {
                   1270:                        if (type != MT_OOBDATA)
                   1271:                                break;
                   1272:                } else if (type == MT_OOBDATA)
                   1273:                        break;
                   1274: #ifdef DIAGNOSTIC
                   1275:                else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
                   1276:                        panic("receive 3");
                   1277: #endif
                   1278:                so->so_state &= ~SS_RCVATMARK;
                   1279:                len = uio->uio_resid;
                   1280:                if (so->so_oobmark && len > so->so_oobmark - offset)
                   1281:                        len = so->so_oobmark - offset;
                   1282:                if (len > m->m_len - moff)
                   1283:                        len = m->m_len - moff;
                   1284:                /*
                   1285:                 * If mp is set, just pass back the mbufs.
                   1286:                 * Otherwise copy them out via the uio, then free.
                   1287:                 * Sockbuf must be consistent here (points to current mbuf,
                   1288:                 * it points to next record) when we drop priority;
                   1289:                 * we must note any additions to the sockbuf when we
                   1290:                 * block interrupts again.
                   1291:                 */
1.144     dyoung   1292:                if (mp == NULL) {
1.69      thorpej  1293:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
                   1294:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.1       cgd      1295:                        splx(s);
1.134     christos 1296:                        error = uiomove(mtod(m, char *) + moff, (int)len, uio);
1.20      mycroft  1297:                        s = splsoftnet();
1.144     dyoung   1298:                        if (error != 0) {
1.67      he       1299:                                /*
                   1300:                                 * If any part of the record has been removed
                   1301:                                 * (such as the MT_SONAME mbuf, which will
                   1302:                                 * happen when PR_ADDR, and thus also
                   1303:                                 * PR_ATOMIC, is set), then drop the entire
                   1304:                                 * record to maintain the atomicity of the
                   1305:                                 * receive operation.
                   1306:                                 *
                   1307:                                 * This avoids a later panic("receive 1a")
                   1308:                                 * when compiled with DIAGNOSTIC.
                   1309:                                 */
1.146     dyoung   1310:                                if (m && mbuf_removed && atomic)
1.67      he       1311:                                        (void) sbdroprecord(&so->so_rcv);
                   1312:
1.57      jdolecek 1313:                                goto release;
1.67      he       1314:                        }
1.1       cgd      1315:                } else
                   1316:                        uio->uio_resid -= len;
                   1317:                if (len == m->m_len - moff) {
                   1318:                        if (m->m_flags & M_EOR)
                   1319:                                flags |= MSG_EOR;
                   1320:                        if (flags & MSG_PEEK) {
                   1321:                                m = m->m_next;
                   1322:                                moff = 0;
                   1323:                        } else {
                   1324:                                nextrecord = m->m_nextpkt;
                   1325:                                sbfree(&so->so_rcv, m);
                   1326:                                if (mp) {
                   1327:                                        *mp = m;
                   1328:                                        mp = &m->m_next;
                   1329:                                        so->so_rcv.sb_mb = m = m->m_next;
1.140     dyoung   1330:                                        *mp = NULL;
1.1       cgd      1331:                                } else {
                   1332:                                        MFREE(m, so->so_rcv.sb_mb);
                   1333:                                        m = so->so_rcv.sb_mb;
                   1334:                                }
1.69      thorpej  1335:                                /*
                   1336:                                 * If m != NULL, we also know that
                   1337:                                 * so->so_rcv.sb_mb != NULL.
                   1338:                                 */
                   1339:                                KASSERT(so->so_rcv.sb_mb == m);
                   1340:                                if (m) {
1.1       cgd      1341:                                        m->m_nextpkt = nextrecord;
1.69      thorpej  1342:                                        if (nextrecord == NULL)
                   1343:                                                so->so_rcv.sb_lastrecord = m;
                   1344:                                } else {
                   1345:                                        so->so_rcv.sb_mb = nextrecord;
1.70      thorpej  1346:                                        SB_EMPTY_FIXUP(&so->so_rcv);
1.69      thorpej  1347:                                }
                   1348:                                SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
                   1349:                                SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1       cgd      1350:                        }
1.144     dyoung   1351:                } else if (flags & MSG_PEEK)
                   1352:                        moff += len;
                   1353:                else {
                   1354:                        if (mp != NULL)
                   1355:                                *mp = m_copym(m, 0, len, M_WAIT);
                   1356:                        m->m_data += len;
                   1357:                        m->m_len -= len;
                   1358:                        so->so_rcv.sb_cc -= len;
1.1       cgd      1359:                }
                   1360:                if (so->so_oobmark) {
                   1361:                        if ((flags & MSG_PEEK) == 0) {
                   1362:                                so->so_oobmark -= len;
                   1363:                                if (so->so_oobmark == 0) {
                   1364:                                        so->so_state |= SS_RCVATMARK;
                   1365:                                        break;
                   1366:                                }
1.7       cgd      1367:                        } else {
1.1       cgd      1368:                                offset += len;
1.7       cgd      1369:                                if (offset == so->so_oobmark)
                   1370:                                        break;
                   1371:                        }
1.1       cgd      1372:                }
                   1373:                if (flags & MSG_EOR)
                   1374:                        break;
                   1375:                /*
                   1376:                 * If the MSG_WAITALL flag is set (for non-atomic socket),
                   1377:                 * we must not quit until "uio->uio_resid == 0" or an error
                   1378:                 * termination.  If a signal/timeout occurs, return
                   1379:                 * with a short count but without error.
                   1380:                 * Keep sockbuf locked against other readers.
                   1381:                 */
1.144     dyoung   1382:                while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3       andrew   1383:                    !sosendallatonce(so) && !nextrecord) {
1.1       cgd      1384:                        if (so->so_error || so->so_state & SS_CANTRCVMORE)
                   1385:                                break;
1.68      matt     1386:                        /*
                   1387:                         * If we are peeking and the socket receive buffer is
                   1388:                         * full, stop since we can't get more data to peek at.
                   1389:                         */
                   1390:                        if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
                   1391:                                break;
                   1392:                        /*
                   1393:                         * If we've drained the socket buffer, tell the
                   1394:                         * protocol in case it needs to do something to
                   1395:                         * get it filled again.
                   1396:                         */
                   1397:                        if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
                   1398:                                (*pr->pr_usrreq)(so, PRU_RCVD,
1.140     dyoung   1399:                                    NULL, (struct mbuf *)(long)flags, NULL, l);
1.69      thorpej  1400:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
                   1401:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.1       cgd      1402:                        error = sbwait(&so->so_rcv);
1.144     dyoung   1403:                        if (error != 0) {
1.1       cgd      1404:                                sbunlock(&so->so_rcv);
                   1405:                                splx(s);
1.144     dyoung   1406:                                return 0;
1.1       cgd      1407:                        }
1.21      christos 1408:                        if ((m = so->so_rcv.sb_mb) != NULL)
1.1       cgd      1409:                                nextrecord = m->m_nextpkt;
                   1410:                }
                   1411:        }
1.3       andrew   1412:
1.146     dyoung   1413:        if (m && atomic) {
1.3       andrew   1414:                flags |= MSG_TRUNC;
                   1415:                if ((flags & MSG_PEEK) == 0)
                   1416:                        (void) sbdroprecord(&so->so_rcv);
                   1417:        }
1.1       cgd      1418:        if ((flags & MSG_PEEK) == 0) {
1.144     dyoung   1419:                if (m == NULL) {
1.69      thorpej  1420:                        /*
1.70      thorpej  1421:                         * First part is an inline SB_EMPTY_FIXUP().  Second
1.69      thorpej  1422:                         * part makes sure sb_lastrecord is up-to-date if
                   1423:                         * there is still data in the socket buffer.
                   1424:                         */
1.1       cgd      1425:                        so->so_rcv.sb_mb = nextrecord;
1.69      thorpej  1426:                        if (so->so_rcv.sb_mb == NULL) {
                   1427:                                so->so_rcv.sb_mbtail = NULL;
                   1428:                                so->so_rcv.sb_lastrecord = NULL;
                   1429:                        } else if (nextrecord->m_nextpkt == NULL)
                   1430:                                so->so_rcv.sb_lastrecord = nextrecord;
                   1431:                }
                   1432:                SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
                   1433:                SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1       cgd      1434:                if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.140     dyoung   1435:                        (*pr->pr_usrreq)(so, PRU_RCVD, NULL,
                   1436:                            (struct mbuf *)(long)flags, NULL, l);
1.1       cgd      1437:        }
1.3       andrew   1438:        if (orig_resid == uio->uio_resid && orig_resid &&
                   1439:            (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
                   1440:                sbunlock(&so->so_rcv);
                   1441:                splx(s);
                   1442:                goto restart;
                   1443:        }
1.108     perry    1444:
1.144     dyoung   1445:        if (flagsp != NULL)
1.1       cgd      1446:                *flagsp |= flags;
1.54      lukem    1447:  release:
1.1       cgd      1448:        sbunlock(&so->so_rcv);
                   1449:        splx(s);
1.144     dyoung   1450:        return error;
1.1       cgd      1451: }
                   1452:
1.14      mycroft  1453: int
1.54      lukem    1454: soshutdown(struct socket *so, int how)
1.1       cgd      1455: {
1.99      matt     1456:        const struct protosw    *pr;
1.34      kleink   1457:
1.54      lukem    1458:        pr = so->so_proto;
1.34      kleink   1459:        if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
                   1460:                return (EINVAL);
1.1       cgd      1461:
1.34      kleink   1462:        if (how == SHUT_RD || how == SHUT_RDWR)
1.1       cgd      1463:                sorflush(so);
1.34      kleink   1464:        if (how == SHUT_WR || how == SHUT_RDWR)
1.140     dyoung   1465:                return (*pr->pr_usrreq)(so, PRU_SHUTDOWN, NULL,
                   1466:                    NULL, NULL, NULL);
1.144     dyoung   1467:        return 0;
1.1       cgd      1468: }
                   1469:
1.14      mycroft  1470: void
1.54      lukem    1471: sorflush(struct socket *so)
1.1       cgd      1472: {
1.54      lukem    1473:        struct sockbuf  *sb, asb;
1.99      matt     1474:        const struct protosw    *pr;
1.54      lukem    1475:        int             s;
1.1       cgd      1476:
1.54      lukem    1477:        sb = &so->so_rcv;
                   1478:        pr = so->so_proto;
1.1       cgd      1479:        sb->sb_flags |= SB_NOINTR;
1.15      mycroft  1480:        (void) sblock(sb, M_WAITOK);
1.56      thorpej  1481:        s = splnet();
1.1       cgd      1482:        socantrcvmore(so);
                   1483:        sbunlock(sb);
                   1484:        asb = *sb;
1.86      wrstuden 1485:        /*
                   1486:         * Clear most of the sockbuf structure, but leave some of the
                   1487:         * fields valid.
                   1488:         */
                   1489:        memset(&sb->sb_startzero, 0,
                   1490:            sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.1       cgd      1491:        splx(s);
                   1492:        if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose)
                   1493:                (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.98      christos 1494:        sbrelease(&asb, so);
1.1       cgd      1495: }
                   1496:
1.142     dyoung   1497: static int
                   1498: sosetopt1(struct socket *so, int level, int optname, struct mbuf *m)
1.1       cgd      1499: {
1.142     dyoung   1500:        int optval, val;
1.130     christos 1501:        struct linger   *l;
1.141     yamt     1502:        struct sockbuf  *sb;
1.142     dyoung   1503:        struct timeval *tv;
                   1504:
                   1505:        switch (optname) {
                   1506:
                   1507:        case SO_LINGER:
                   1508:                if (m == NULL || m->m_len != sizeof(struct linger))
                   1509:                        return EINVAL;
                   1510:                l = mtod(m, struct linger *);
                   1511:                if (l->l_linger < 0 || l->l_linger > USHRT_MAX ||
                   1512:                    l->l_linger > (INT_MAX / hz))
                   1513:                        return EDOM;
                   1514:                so->so_linger = l->l_linger;
                   1515:                if (l->l_onoff)
                   1516:                        so->so_options |= SO_LINGER;
                   1517:                else
                   1518:                        so->so_options &= ~SO_LINGER;
                   1519:                break;
1.1       cgd      1520:
1.142     dyoung   1521:        case SO_DEBUG:
                   1522:        case SO_KEEPALIVE:
                   1523:        case SO_DONTROUTE:
                   1524:        case SO_USELOOPBACK:
                   1525:        case SO_BROADCAST:
                   1526:        case SO_REUSEADDR:
                   1527:        case SO_REUSEPORT:
                   1528:        case SO_OOBINLINE:
                   1529:        case SO_TIMESTAMP:
                   1530:                if (m == NULL || m->m_len < sizeof(int))
                   1531:                        return EINVAL;
                   1532:                if (*mtod(m, int *))
                   1533:                        so->so_options |= optname;
                   1534:                else
                   1535:                        so->so_options &= ~optname;
                   1536:                break;
                   1537:
                   1538:        case SO_SNDBUF:
                   1539:        case SO_RCVBUF:
                   1540:        case SO_SNDLOWAT:
                   1541:        case SO_RCVLOWAT:
                   1542:                if (m == NULL || m->m_len < sizeof(int))
                   1543:                        return EINVAL;
1.1       cgd      1544:
1.142     dyoung   1545:                /*
                   1546:                 * Values < 1 make no sense for any of these
                   1547:                 * options, so disallow them.
                   1548:                 */
                   1549:                optval = *mtod(m, int *);
                   1550:                if (optval < 1)
                   1551:                        return EINVAL;
1.1       cgd      1552:
1.142     dyoung   1553:                switch (optname) {
1.1       cgd      1554:
                   1555:                case SO_SNDBUF:
                   1556:                case SO_RCVBUF:
1.142     dyoung   1557:                        sb = (optname == SO_SNDBUF) ?
                   1558:                            &so->so_snd : &so->so_rcv;
                   1559:                        if (sbreserve(sb, (u_long)optval, so) == 0)
                   1560:                                return ENOBUFS;
                   1561:                        sb->sb_flags &= ~SB_AUTOSIZE;
                   1562:                        break;
                   1563:
                   1564:                /*
                   1565:                 * Make sure the low-water is never greater than
                   1566:                 * the high-water.
                   1567:                 */
1.1       cgd      1568:                case SO_SNDLOWAT:
1.142     dyoung   1569:                        so->so_snd.sb_lowat =
                   1570:                            (optval > so->so_snd.sb_hiwat) ?
                   1571:                            so->so_snd.sb_hiwat : optval;
                   1572:                        break;
1.1       cgd      1573:                case SO_RCVLOWAT:
1.142     dyoung   1574:                        so->so_rcv.sb_lowat =
                   1575:                            (optval > so->so_rcv.sb_hiwat) ?
                   1576:                            so->so_rcv.sb_hiwat : optval;
                   1577:                        break;
                   1578:                }
                   1579:                break;
1.28      thorpej  1580:
1.142     dyoung   1581:        case SO_SNDTIMEO:
                   1582:        case SO_RCVTIMEO:
                   1583:                if (m == NULL || m->m_len < sizeof(*tv))
                   1584:                        return EINVAL;
                   1585:                tv = mtod(m, struct timeval *);
                   1586:                if (tv->tv_sec > (INT_MAX - tv->tv_usec / tick) / hz)
                   1587:                        return EDOM;
                   1588:                val = tv->tv_sec * hz + tv->tv_usec / tick;
                   1589:                if (val == 0 && tv->tv_usec != 0)
                   1590:                        val = 1;
1.28      thorpej  1591:
1.142     dyoung   1592:                switch (optname) {
1.28      thorpej  1593:
1.142     dyoung   1594:                case SO_SNDTIMEO:
                   1595:                        so->so_snd.sb_timeo = val;
1.1       cgd      1596:                        break;
                   1597:                case SO_RCVTIMEO:
1.142     dyoung   1598:                        so->so_rcv.sb_timeo = val;
                   1599:                        break;
                   1600:                }
                   1601:                break;
1.1       cgd      1602:
1.142     dyoung   1603:        default:
                   1604:                return ENOPROTOOPT;
                   1605:        }
                   1606:        return 0;
                   1607: }
1.1       cgd      1608:
1.142     dyoung   1609: int
                   1610: sosetopt(struct socket *so, int level, int optname, struct mbuf *m)
                   1611: {
                   1612:        int error, prerr;
1.1       cgd      1613:
1.142     dyoung   1614:        if (level == SOL_SOCKET)
                   1615:                error = sosetopt1(so, level, optname, m);
                   1616:        else
                   1617:                error = ENOPROTOOPT;
1.1       cgd      1618:
1.142     dyoung   1619:        if ((error == 0 || error == ENOPROTOOPT) &&
                   1620:            so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
                   1621:                /* give the protocol stack a shot */
                   1622:                prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, level,
                   1623:                    optname, &m);
                   1624:                if (prerr == 0)
                   1625:                        error = 0;
                   1626:                else if (prerr != ENOPROTOOPT)
                   1627:                        error = prerr;
                   1628:        } else if (m != NULL)
                   1629:                (void)m_free(m);
                   1630:        return error;
1.1       cgd      1631: }
                   1632:
1.14      mycroft  1633: int
1.54      lukem    1634: sogetopt(struct socket *so, int level, int optname, struct mbuf **mp)
1.1       cgd      1635: {
1.54      lukem    1636:        struct mbuf     *m;
1.1       cgd      1637:
                   1638:        if (level != SOL_SOCKET) {
                   1639:                if (so->so_proto && so->so_proto->pr_ctloutput) {
                   1640:                        return ((*so->so_proto->pr_ctloutput)
                   1641:                                  (PRCO_GETOPT, so, level, optname, mp));
                   1642:                } else
                   1643:                        return (ENOPROTOOPT);
                   1644:        } else {
                   1645:                m = m_get(M_WAIT, MT_SOOPTS);
1.36      perry    1646:                m->m_len = sizeof(int);
1.1       cgd      1647:
                   1648:                switch (optname) {
                   1649:
                   1650:                case SO_LINGER:
1.36      perry    1651:                        m->m_len = sizeof(struct linger);
1.1       cgd      1652:                        mtod(m, struct linger *)->l_onoff =
1.131     christos 1653:                            (so->so_options & SO_LINGER) ? 1 : 0;
1.1       cgd      1654:                        mtod(m, struct linger *)->l_linger = so->so_linger;
                   1655:                        break;
                   1656:
                   1657:                case SO_USELOOPBACK:
                   1658:                case SO_DONTROUTE:
                   1659:                case SO_DEBUG:
                   1660:                case SO_KEEPALIVE:
                   1661:                case SO_REUSEADDR:
1.15      mycroft  1662:                case SO_REUSEPORT:
1.1       cgd      1663:                case SO_BROADCAST:
                   1664:                case SO_OOBINLINE:
1.26      thorpej  1665:                case SO_TIMESTAMP:
1.131     christos 1666:                        *mtod(m, int *) = (so->so_options & optname) ? 1 : 0;
1.1       cgd      1667:                        break;
                   1668:
                   1669:                case SO_TYPE:
                   1670:                        *mtod(m, int *) = so->so_type;
                   1671:                        break;
                   1672:
                   1673:                case SO_ERROR:
                   1674:                        *mtod(m, int *) = so->so_error;
                   1675:                        so->so_error = 0;
                   1676:                        break;
                   1677:
                   1678:                case SO_SNDBUF:
                   1679:                        *mtod(m, int *) = so->so_snd.sb_hiwat;
                   1680:                        break;
                   1681:
                   1682:                case SO_RCVBUF:
                   1683:                        *mtod(m, int *) = so->so_rcv.sb_hiwat;
                   1684:                        break;
                   1685:
                   1686:                case SO_SNDLOWAT:
                   1687:                        *mtod(m, int *) = so->so_snd.sb_lowat;
                   1688:                        break;
                   1689:
                   1690:                case SO_RCVLOWAT:
                   1691:                        *mtod(m, int *) = so->so_rcv.sb_lowat;
                   1692:                        break;
                   1693:
                   1694:                case SO_SNDTIMEO:
                   1695:                case SO_RCVTIMEO:
                   1696:                    {
                   1697:                        int val = (optname == SO_SNDTIMEO ?
                   1698:                             so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
                   1699:
                   1700:                        m->m_len = sizeof(struct timeval);
                   1701:                        mtod(m, struct timeval *)->tv_sec = val / hz;
                   1702:                        mtod(m, struct timeval *)->tv_usec =
1.27      kleink   1703:                            (val % hz) * tick;
1.1       cgd      1704:                        break;
                   1705:                    }
                   1706:
1.107     darrenr  1707:                case SO_OVERFLOWED:
                   1708:                        *mtod(m, int *) = so->so_rcv.sb_overflowed;
                   1709:                        break;
                   1710:
1.1       cgd      1711:                default:
                   1712:                        (void)m_free(m);
                   1713:                        return (ENOPROTOOPT);
                   1714:                }
                   1715:                *mp = m;
                   1716:                return (0);
                   1717:        }
                   1718: }
                   1719:
1.14      mycroft  1720: void
1.54      lukem    1721: sohasoutofband(struct socket *so)
1.1       cgd      1722: {
1.153     rmind    1723:
1.90      christos 1724:        fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.153     rmind    1725:        selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, 0);
1.1       cgd      1726: }
1.72      jdolecek 1727:
                   1728: static void
                   1729: filt_sordetach(struct knote *kn)
                   1730: {
                   1731:        struct socket   *so;
                   1732:
1.155     ad       1733:        so = ((file_t *)kn->kn_obj)->f_data;
1.73      christos 1734:        SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
                   1735:        if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72      jdolecek 1736:                so->so_rcv.sb_flags &= ~SB_KNOTE;
                   1737: }
                   1738:
                   1739: /*ARGSUSED*/
                   1740: static int
1.129     yamt     1741: filt_soread(struct knote *kn, long hint)
1.72      jdolecek 1742: {
                   1743:        struct socket   *so;
                   1744:
1.155     ad       1745:        so = ((file_t *)kn->kn_obj)->f_data;
1.72      jdolecek 1746:        kn->kn_data = so->so_rcv.sb_cc;
                   1747:        if (so->so_state & SS_CANTRCVMORE) {
1.108     perry    1748:                kn->kn_flags |= EV_EOF;
1.72      jdolecek 1749:                kn->kn_fflags = so->so_error;
                   1750:                return (1);
                   1751:        }
                   1752:        if (so->so_error)       /* temporary udp error */
                   1753:                return (1);
                   1754:        if (kn->kn_sfflags & NOTE_LOWAT)
                   1755:                return (kn->kn_data >= kn->kn_sdata);
                   1756:        return (kn->kn_data >= so->so_rcv.sb_lowat);
                   1757: }
                   1758:
                   1759: static void
                   1760: filt_sowdetach(struct knote *kn)
                   1761: {
                   1762:        struct socket   *so;
                   1763:
1.155     ad       1764:        so = ((file_t *)kn->kn_obj)->f_data;
1.73      christos 1765:        SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
                   1766:        if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72      jdolecek 1767:                so->so_snd.sb_flags &= ~SB_KNOTE;
                   1768: }
                   1769:
                   1770: /*ARGSUSED*/
                   1771: static int
1.129     yamt     1772: filt_sowrite(struct knote *kn, long hint)
1.72      jdolecek 1773: {
                   1774:        struct socket   *so;
                   1775:
1.155     ad       1776:        so = ((file_t *)kn->kn_obj)->f_data;
1.72      jdolecek 1777:        kn->kn_data = sbspace(&so->so_snd);
                   1778:        if (so->so_state & SS_CANTSENDMORE) {
1.108     perry    1779:                kn->kn_flags |= EV_EOF;
1.72      jdolecek 1780:                kn->kn_fflags = so->so_error;
                   1781:                return (1);
                   1782:        }
                   1783:        if (so->so_error)       /* temporary udp error */
                   1784:                return (1);
                   1785:        if (((so->so_state & SS_ISCONNECTED) == 0) &&
                   1786:            (so->so_proto->pr_flags & PR_CONNREQUIRED))
                   1787:                return (0);
                   1788:        if (kn->kn_sfflags & NOTE_LOWAT)
                   1789:                return (kn->kn_data >= kn->kn_sdata);
                   1790:        return (kn->kn_data >= so->so_snd.sb_lowat);
                   1791: }
                   1792:
                   1793: /*ARGSUSED*/
                   1794: static int
1.129     yamt     1795: filt_solisten(struct knote *kn, long hint)
1.72      jdolecek 1796: {
                   1797:        struct socket   *so;
                   1798:
1.155     ad       1799:        so = ((file_t *)kn->kn_obj)->f_data;
1.72      jdolecek 1800:
                   1801:        /*
                   1802:         * Set kn_data to number of incoming connections, not
                   1803:         * counting partial (incomplete) connections.
1.108     perry    1804:         */
1.72      jdolecek 1805:        kn->kn_data = so->so_qlen;
                   1806:        return (kn->kn_data > 0);
                   1807: }
                   1808:
                   1809: static const struct filterops solisten_filtops =
                   1810:        { 1, NULL, filt_sordetach, filt_solisten };
                   1811: static const struct filterops soread_filtops =
                   1812:        { 1, NULL, filt_sordetach, filt_soread };
                   1813: static const struct filterops sowrite_filtops =
                   1814:        { 1, NULL, filt_sowdetach, filt_sowrite };
                   1815:
                   1816: int
1.129     yamt     1817: soo_kqfilter(struct file *fp, struct knote *kn)
1.72      jdolecek 1818: {
                   1819:        struct socket   *so;
                   1820:        struct sockbuf  *sb;
                   1821:
1.155     ad       1822:        so = ((file_t *)kn->kn_obj)->f_data;
1.72      jdolecek 1823:        switch (kn->kn_filter) {
                   1824:        case EVFILT_READ:
                   1825:                if (so->so_options & SO_ACCEPTCONN)
                   1826:                        kn->kn_fop = &solisten_filtops;
                   1827:                else
                   1828:                        kn->kn_fop = &soread_filtops;
                   1829:                sb = &so->so_rcv;
                   1830:                break;
                   1831:        case EVFILT_WRITE:
                   1832:                kn->kn_fop = &sowrite_filtops;
                   1833:                sb = &so->so_snd;
                   1834:                break;
                   1835:        default:
1.149     pooka    1836:                return (EINVAL);
1.72      jdolecek 1837:        }
1.73      christos 1838:        SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72      jdolecek 1839:        sb->sb_flags |= SB_KNOTE;
                   1840:        return (0);
                   1841: }
                   1842:
1.154     ad       1843: static int
                   1844: sodopoll(struct socket *so, int events)
                   1845: {
                   1846:        int revents;
                   1847:
                   1848:        revents = 0;
                   1849:
                   1850:        if (events & (POLLIN | POLLRDNORM))
                   1851:                if (soreadable(so))
                   1852:                        revents |= events & (POLLIN | POLLRDNORM);
                   1853:
                   1854:        if (events & (POLLOUT | POLLWRNORM))
                   1855:                if (sowritable(so))
                   1856:                        revents |= events & (POLLOUT | POLLWRNORM);
                   1857:
                   1858:        if (events & (POLLPRI | POLLRDBAND))
                   1859:                if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
                   1860:                        revents |= events & (POLLPRI | POLLRDBAND);
                   1861:
                   1862:        return revents;
                   1863: }
                   1864:
                   1865: int
                   1866: sopoll(struct socket *so, int events)
                   1867: {
                   1868:        int revents = 0;
                   1869:        int s;
                   1870:
                   1871:        if ((revents = sodopoll(so, events)) != 0)
                   1872:                return revents;
                   1873:
                   1874:        KERNEL_LOCK(1, curlwp);
                   1875:        s = splsoftnet();
                   1876:
                   1877:        if ((revents = sodopoll(so, events)) == 0) {
                   1878:                if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
                   1879:                        selrecord(curlwp, &so->so_rcv.sb_sel);
                   1880:                        so->so_rcv.sb_flags |= SB_SEL;
                   1881:                }
                   1882:
                   1883:                if (events & (POLLOUT | POLLWRNORM)) {
                   1884:                        selrecord(curlwp, &so->so_snd.sb_sel);
                   1885:                        so->so_snd.sb_flags |= SB_SEL;
                   1886:                }
                   1887:        }
                   1888:
                   1889:        splx(s);
                   1890:        KERNEL_UNLOCK_ONE(curlwp);
                   1891:
                   1892:        return revents;
                   1893: }
                   1894:
                   1895:
1.94      yamt     1896: #include <sys/sysctl.h>
                   1897:
                   1898: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
                   1899:
                   1900: /*
                   1901:  * sysctl helper routine for kern.somaxkva.  ensures that the given
                   1902:  * value is not too small.
                   1903:  * (XXX should we maybe make sure it's not too large as well?)
                   1904:  */
                   1905: static int
                   1906: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
                   1907: {
                   1908:        int error, new_somaxkva;
                   1909:        struct sysctlnode node;
                   1910:
                   1911:        new_somaxkva = somaxkva;
                   1912:        node = *rnode;
                   1913:        node.sysctl_data = &new_somaxkva;
                   1914:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1915:        if (error || newp == NULL)
                   1916:                return (error);
                   1917:
                   1918:        if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
                   1919:                return (EINVAL);
                   1920:
1.136     ad       1921:        mutex_enter(&so_pendfree_lock);
1.94      yamt     1922:        somaxkva = new_somaxkva;
1.136     ad       1923:        cv_broadcast(&socurkva_cv);
                   1924:        mutex_exit(&so_pendfree_lock);
1.94      yamt     1925:
                   1926:        return (error);
                   1927: }
                   1928:
                   1929: SYSCTL_SETUP(sysctl_kern_somaxkva_setup, "sysctl kern.somaxkva setup")
                   1930: {
                   1931:
1.97      atatat   1932:        sysctl_createv(clog, 0, NULL, NULL,
                   1933:                       CTLFLAG_PERMANENT,
                   1934:                       CTLTYPE_NODE, "kern", NULL,
                   1935:                       NULL, 0, NULL, 0,
                   1936:                       CTL_KERN, CTL_EOL);
                   1937:
                   1938:        sysctl_createv(clog, 0, NULL, NULL,
                   1939:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103     atatat   1940:                       CTLTYPE_INT, "somaxkva",
                   1941:                       SYSCTL_DESCR("Maximum amount of kernel memory to be "
                   1942:                                    "used for socket buffers"),
1.94      yamt     1943:                       sysctl_kern_somaxkva, 0, NULL, 0,
                   1944:                       CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
                   1945: }

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