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Annotation of src/sys/kern/uipc_socket.c, Revision 1.209

1.209   ! matt        1: /*     $NetBSD: uipc_socket.c,v 1.208 2012/01/27 19:48:40 para Exp $   */
1.64      thorpej     2:
                      3: /*-
1.188     ad          4:  * Copyright (c) 2002, 2007, 2008, 2009 The NetBSD Foundation, Inc.
1.64      thorpej     5:  * All rights reserved.
                      6:  *
                      7:  * This code is derived from software contributed to The NetBSD Foundation
1.188     ad          8:  * by Jason R. Thorpe of Wasabi Systems, Inc, and by Andrew Doran.
1.64      thorpej     9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     20:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     21:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     22:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     23:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     24:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     25:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     26:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     27:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     28:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     29:  * POSSIBILITY OF SUCH DAMAGE.
                     30:  */
1.16      cgd        31:
1.1       cgd        32: /*
1.159     ad         33:  * Copyright (c) 2004 The FreeBSD Foundation
                     34:  * Copyright (c) 2004 Robert Watson
1.15      mycroft    35:  * Copyright (c) 1982, 1986, 1988, 1990, 1993
                     36:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        37:  *
                     38:  * Redistribution and use in source and binary forms, with or without
                     39:  * modification, are permitted provided that the following conditions
                     40:  * are met:
                     41:  * 1. Redistributions of source code must retain the above copyright
                     42:  *    notice, this list of conditions and the following disclaimer.
                     43:  * 2. Redistributions in binary form must reproduce the above copyright
                     44:  *    notice, this list of conditions and the following disclaimer in the
                     45:  *    documentation and/or other materials provided with the distribution.
1.85      agc        46:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        47:  *    may be used to endorse or promote products derived from this software
                     48:  *    without specific prior written permission.
                     49:  *
                     50:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     51:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     52:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     53:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     54:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     55:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     56:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     57:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     58:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     59:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     60:  * SUCH DAMAGE.
                     61:  *
1.32      fvdl       62:  *     @(#)uipc_socket.c       8.6 (Berkeley) 5/2/95
1.1       cgd        63:  */
1.59      lukem      64:
                     65: #include <sys/cdefs.h>
1.209   ! matt       66: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.208 2012/01/27 19:48:40 para Exp $");
1.64      thorpej    67:
1.179     christos   68: #include "opt_compat_netbsd.h"
1.64      thorpej    69: #include "opt_sock_counters.h"
                     70: #include "opt_sosend_loan.h"
1.81      martin     71: #include "opt_mbuftrace.h"
1.84      ragge      72: #include "opt_somaxkva.h"
1.167     ad         73: #include "opt_multiprocessor.h"        /* XXX */
1.1       cgd        74:
1.9       mycroft    75: #include <sys/param.h>
                     76: #include <sys/systm.h>
                     77: #include <sys/proc.h>
                     78: #include <sys/file.h>
1.142     dyoung     79: #include <sys/filedesc.h>
1.173     plunky     80: #include <sys/kmem.h>
1.9       mycroft    81: #include <sys/mbuf.h>
                     82: #include <sys/domain.h>
                     83: #include <sys/kernel.h>
                     84: #include <sys/protosw.h>
                     85: #include <sys/socket.h>
                     86: #include <sys/socketvar.h>
1.21      christos   87: #include <sys/signalvar.h>
1.9       mycroft    88: #include <sys/resourcevar.h>
1.174     pooka      89: #include <sys/uidinfo.h>
1.72      jdolecek   90: #include <sys/event.h>
1.89      christos   91: #include <sys/poll.h>
1.118     elad       92: #include <sys/kauth.h>
1.136     ad         93: #include <sys/mutex.h>
                     94: #include <sys/condvar.h>
1.205     bouyer     95: #include <sys/kthread.h>
1.37      thorpej    96:
1.179     christos   97: #ifdef COMPAT_50
                     98: #include <compat/sys/time.h>
1.184     christos   99: #include <compat/sys/socket.h>
1.179     christos  100: #endif
                    101:
1.202     uebayasi  102: #include <uvm/uvm_extern.h>
                    103: #include <uvm/uvm_loan.h>
                    104: #include <uvm/uvm_page.h>
1.64      thorpej   105:
1.77      thorpej   106: MALLOC_DEFINE(M_SOOPTS, "soopts", "socket options");
                    107: MALLOC_DEFINE(M_SONAME, "soname", "socket name");
1.37      thorpej   108:
1.142     dyoung    109: extern const struct fileops socketops;
                    110:
1.54      lukem     111: extern int     somaxconn;                      /* patchable (XXX sysctl) */
                    112: int            somaxconn = SOMAXCONN;
1.160     ad        113: kmutex_t       *softnet_lock;
1.49      jonathan  114:
1.64      thorpej   115: #ifdef SOSEND_COUNTERS
                    116: #include <sys/device.h>
                    117:
1.113     thorpej   118: static struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   119:     NULL, "sosend", "loan big");
1.113     thorpej   120: static struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   121:     NULL, "sosend", "copy big");
1.113     thorpej   122: static struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   123:     NULL, "sosend", "copy small");
1.113     thorpej   124: static struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   125:     NULL, "sosend", "kva limit");
                    126:
                    127: #define        SOSEND_COUNTER_INCR(ev)         (ev)->ev_count++
                    128:
1.101     matt      129: EVCNT_ATTACH_STATIC(sosend_loan_big);
                    130: EVCNT_ATTACH_STATIC(sosend_copy_big);
                    131: EVCNT_ATTACH_STATIC(sosend_copy_small);
                    132: EVCNT_ATTACH_STATIC(sosend_kvalimit);
1.64      thorpej   133: #else
                    134:
                    135: #define        SOSEND_COUNTER_INCR(ev)         /* nothing */
                    136:
                    137: #endif /* SOSEND_COUNTERS */
                    138:
1.167     ad        139: #if defined(SOSEND_NO_LOAN) || defined(MULTIPROCESSOR)
1.121     yamt      140: int sock_loan_thresh = -1;
1.71      thorpej   141: #else
1.121     yamt      142: int sock_loan_thresh = 4096;
1.65      thorpej   143: #endif
1.64      thorpej   144:
1.136     ad        145: static kmutex_t so_pendfree_lock;
1.205     bouyer    146: static struct mbuf *so_pendfree = NULL;
1.64      thorpej   147:
1.84      ragge     148: #ifndef SOMAXKVA
                    149: #define        SOMAXKVA (16 * 1024 * 1024)
                    150: #endif
                    151: int somaxkva = SOMAXKVA;
1.113     thorpej   152: static int socurkva;
1.136     ad        153: static kcondvar_t socurkva_cv;
1.64      thorpej   154:
1.191     elad      155: static kauth_listener_t socket_listener;
                    156:
1.64      thorpej   157: #define        SOCK_LOAN_CHUNK         65536
                    158:
1.205     bouyer    159: static void sopendfree_thread(void *);
                    160: static kcondvar_t pendfree_thread_cv;
                    161: static lwp_t *sopendfree_lwp;
1.93      yamt      162:
1.178     pooka     163: static void sysctl_kern_somaxkva_setup(void);
                    164: static struct sysctllog *socket_sysctllog;
                    165:
1.113     thorpej   166: static vsize_t
1.129     yamt      167: sokvareserve(struct socket *so, vsize_t len)
1.80      yamt      168: {
1.98      christos  169:        int error;
1.80      yamt      170:
1.136     ad        171:        mutex_enter(&so_pendfree_lock);
1.80      yamt      172:        while (socurkva + len > somaxkva) {
                    173:                SOSEND_COUNTER_INCR(&sosend_kvalimit);
1.136     ad        174:                error = cv_wait_sig(&socurkva_cv, &so_pendfree_lock);
1.98      christos  175:                if (error) {
                    176:                        len = 0;
                    177:                        break;
                    178:                }
1.80      yamt      179:        }
1.93      yamt      180:        socurkva += len;
1.136     ad        181:        mutex_exit(&so_pendfree_lock);
1.98      christos  182:        return len;
1.95      yamt      183: }
                    184:
1.113     thorpej   185: static void
1.95      yamt      186: sokvaunreserve(vsize_t len)
                    187: {
                    188:
1.136     ad        189:        mutex_enter(&so_pendfree_lock);
1.95      yamt      190:        socurkva -= len;
1.136     ad        191:        cv_broadcast(&socurkva_cv);
                    192:        mutex_exit(&so_pendfree_lock);
1.95      yamt      193: }
                    194:
                    195: /*
                    196:  * sokvaalloc: allocate kva for loan.
                    197:  */
                    198:
                    199: vaddr_t
1.209   ! matt      200: sokvaalloc(vaddr_t sva, vsize_t len, struct socket *so)
1.95      yamt      201: {
                    202:        vaddr_t lva;
                    203:
                    204:        /*
                    205:         * reserve kva.
                    206:         */
                    207:
1.98      christos  208:        if (sokvareserve(so, len) == 0)
                    209:                return 0;
1.93      yamt      210:
                    211:        /*
                    212:         * allocate kva.
                    213:         */
1.80      yamt      214:
1.209   ! matt      215:        lva = uvm_km_alloc(kernel_map, len, atop(sva) & uvmexp.colormask,
        !           216:            UVM_KMF_COLORMATCH | UVM_KMF_VAONLY | UVM_KMF_WAITVA);
1.95      yamt      217:        if (lva == 0) {
                    218:                sokvaunreserve(len);
1.80      yamt      219:                return (0);
1.95      yamt      220:        }
1.80      yamt      221:
                    222:        return lva;
                    223: }
                    224:
1.93      yamt      225: /*
                    226:  * sokvafree: free kva for loan.
                    227:  */
                    228:
1.80      yamt      229: void
                    230: sokvafree(vaddr_t sva, vsize_t len)
                    231: {
1.93      yamt      232:
                    233:        /*
                    234:         * free kva.
                    235:         */
1.80      yamt      236:
1.109     yamt      237:        uvm_km_free(kernel_map, sva, len, UVM_KMF_VAONLY);
1.93      yamt      238:
                    239:        /*
                    240:         * unreserve kva.
                    241:         */
                    242:
1.95      yamt      243:        sokvaunreserve(len);
1.80      yamt      244: }
                    245:
1.64      thorpej   246: static void
1.134     christos  247: sodoloanfree(struct vm_page **pgs, void *buf, size_t size)
1.64      thorpej   248: {
1.156     yamt      249:        vaddr_t sva, eva;
1.64      thorpej   250:        vsize_t len;
1.156     yamt      251:        int npgs;
                    252:
                    253:        KASSERT(pgs != NULL);
1.64      thorpej   254:
                    255:        eva = round_page((vaddr_t) buf + size);
                    256:        sva = trunc_page((vaddr_t) buf);
                    257:        len = eva - sva;
                    258:        npgs = len >> PAGE_SHIFT;
                    259:
                    260:        pmap_kremove(sva, len);
                    261:        pmap_update(pmap_kernel());
                    262:        uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE);
1.80      yamt      263:        sokvafree(sva, len);
1.64      thorpej   264: }
                    265:
1.93      yamt      266: /*
1.205     bouyer    267:  * sopendfree_thread: free mbufs on "pendfree" list.
1.136     ad        268:  * unlock and relock so_pendfree_lock when freeing mbufs.
1.93      yamt      269:  */
                    270:
1.205     bouyer    271: static void
                    272: sopendfree_thread(void *v)
1.93      yamt      273: {
1.137     ad        274:        struct mbuf *m, *next;
1.205     bouyer    275:        size_t rv;
1.93      yamt      276:
1.205     bouyer    277:        mutex_enter(&so_pendfree_lock);
1.64      thorpej   278:
1.205     bouyer    279:        for (;;) {
                    280:                rv = 0;
                    281:                while (so_pendfree != NULL) {
                    282:                        m = so_pendfree;
                    283:                        so_pendfree = NULL;
                    284:                        mutex_exit(&so_pendfree_lock);
                    285:
                    286:                        for (; m != NULL; m = next) {
                    287:                                next = m->m_next;
                    288:                                KASSERT((~m->m_flags & (M_EXT|M_EXT_PAGES)) == 0);
                    289:                                KASSERT(m->m_ext.ext_refcnt == 0);
                    290:
                    291:                                rv += m->m_ext.ext_size;
                    292:                                sodoloanfree(m->m_ext.ext_pgs, m->m_ext.ext_buf,
                    293:                                    m->m_ext.ext_size);
                    294:                                pool_cache_put(mb_cache, m);
                    295:                        }
1.93      yamt      296:
1.205     bouyer    297:                        mutex_enter(&so_pendfree_lock);
1.93      yamt      298:                }
1.205     bouyer    299:                if (rv)
                    300:                        cv_broadcast(&socurkva_cv);
                    301:                cv_wait(&pendfree_thread_cv, &so_pendfree_lock);
1.64      thorpej   302:        }
1.205     bouyer    303:        panic("sopendfree_thread");
                    304:        /* NOTREACHED */
1.64      thorpej   305: }
                    306:
1.80      yamt      307: void
1.134     christos  308: soloanfree(struct mbuf *m, void *buf, size_t size, void *arg)
1.64      thorpej   309: {
                    310:
1.156     yamt      311:        KASSERT(m != NULL);
1.64      thorpej   312:
1.93      yamt      313:        /*
                    314:         * postpone freeing mbuf.
                    315:         *
                    316:         * we can't do it in interrupt context
                    317:         * because we need to put kva back to kernel_map.
                    318:         */
                    319:
1.136     ad        320:        mutex_enter(&so_pendfree_lock);
1.92      yamt      321:        m->m_next = so_pendfree;
                    322:        so_pendfree = m;
1.205     bouyer    323:        cv_signal(&pendfree_thread_cv);
1.136     ad        324:        mutex_exit(&so_pendfree_lock);
1.64      thorpej   325: }
                    326:
                    327: static long
                    328: sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space)
                    329: {
                    330:        struct iovec *iov = uio->uio_iov;
                    331:        vaddr_t sva, eva;
                    332:        vsize_t len;
1.156     yamt      333:        vaddr_t lva;
                    334:        int npgs, error;
                    335:        vaddr_t va;
                    336:        int i;
1.64      thorpej   337:
1.116     yamt      338:        if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace))
1.64      thorpej   339:                return (0);
                    340:
                    341:        if (iov->iov_len < (size_t) space)
                    342:                space = iov->iov_len;
                    343:        if (space > SOCK_LOAN_CHUNK)
                    344:                space = SOCK_LOAN_CHUNK;
                    345:
                    346:        eva = round_page((vaddr_t) iov->iov_base + space);
                    347:        sva = trunc_page((vaddr_t) iov->iov_base);
                    348:        len = eva - sva;
                    349:        npgs = len >> PAGE_SHIFT;
                    350:
1.79      thorpej   351:        KASSERT(npgs <= M_EXT_MAXPAGES);
                    352:
1.209   ! matt      353:        lva = sokvaalloc(sva, len, so);
1.64      thorpej   354:        if (lva == 0)
1.80      yamt      355:                return 0;
1.64      thorpej   356:
1.116     yamt      357:        error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len,
1.79      thorpej   358:            m->m_ext.ext_pgs, UVM_LOAN_TOPAGE);
1.64      thorpej   359:        if (error) {
1.80      yamt      360:                sokvafree(lva, len);
1.64      thorpej   361:                return (0);
                    362:        }
                    363:
                    364:        for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE)
1.79      thorpej   365:                pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]),
1.194     cegger    366:                    VM_PROT_READ, 0);
1.64      thorpej   367:        pmap_update(pmap_kernel());
                    368:
                    369:        lva += (vaddr_t) iov->iov_base & PAGE_MASK;
                    370:
1.134     christos  371:        MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so);
1.79      thorpej   372:        m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP;
1.64      thorpej   373:
                    374:        uio->uio_resid -= space;
                    375:        /* uio_offset not updated, not set/used for write(2) */
1.134     christos  376:        uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space;
1.64      thorpej   377:        uio->uio_iov->iov_len -= space;
                    378:        if (uio->uio_iov->iov_len == 0) {
                    379:                uio->uio_iov++;
                    380:                uio->uio_iovcnt--;
                    381:        }
                    382:
                    383:        return (space);
                    384: }
                    385:
1.142     dyoung    386: struct mbuf *
1.147     dyoung    387: getsombuf(struct socket *so, int type)
1.142     dyoung    388: {
                    389:        struct mbuf *m;
                    390:
1.147     dyoung    391:        m = m_get(M_WAIT, type);
1.142     dyoung    392:        MCLAIM(m, so->so_mowner);
                    393:        return m;
                    394: }
                    395:
1.191     elad      396: static int
                    397: socket_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
                    398:     void *arg0, void *arg1, void *arg2, void *arg3)
                    399: {
                    400:        int result;
                    401:        enum kauth_network_req req;
                    402:
                    403:        result = KAUTH_RESULT_DEFER;
                    404:        req = (enum kauth_network_req)arg0;
                    405:
1.193     elad      406:        if ((action != KAUTH_NETWORK_SOCKET) &&
                    407:            (action != KAUTH_NETWORK_BIND))
1.191     elad      408:                return result;
                    409:
                    410:        switch (req) {
1.193     elad      411:        case KAUTH_REQ_NETWORK_BIND_PORT:
                    412:                result = KAUTH_RESULT_ALLOW;
                    413:                break;
                    414:
1.191     elad      415:        case KAUTH_REQ_NETWORK_SOCKET_DROP: {
                    416:                /* Normal users can only drop their own connections. */
                    417:                struct socket *so = (struct socket *)arg1;
                    418:
1.199     elad      419:                if (proc_uidmatch(cred, so->so_cred))
1.191     elad      420:                        result = KAUTH_RESULT_ALLOW;
                    421:
                    422:                break;
                    423:                }
                    424:
                    425:        case KAUTH_REQ_NETWORK_SOCKET_OPEN:
                    426:                /* We allow "raw" routing/bluetooth sockets to anyone. */
1.203     matt      427:                if ((u_long)arg1 == PF_ROUTE || (u_long)arg1 == PF_OROUTE
                    428:                    || (u_long)arg1 == PF_BLUETOOTH) {
1.191     elad      429:                        result = KAUTH_RESULT_ALLOW;
1.203     matt      430:                } else {
1.191     elad      431:                        /* Privileged, let secmodel handle this. */
                    432:                        if ((u_long)arg2 == SOCK_RAW)
                    433:                                break;
                    434:                }
                    435:
                    436:                result = KAUTH_RESULT_ALLOW;
                    437:
                    438:                break;
                    439:
1.192     elad      440:        case KAUTH_REQ_NETWORK_SOCKET_CANSEE:
                    441:                result = KAUTH_RESULT_ALLOW;
                    442:
                    443:                break;
                    444:
1.191     elad      445:        default:
                    446:                break;
                    447:        }
                    448:
                    449:        return result;
                    450: }
                    451:
1.119     yamt      452: void
                    453: soinit(void)
                    454: {
                    455:
1.178     pooka     456:        sysctl_kern_somaxkva_setup();
                    457:
1.148     ad        458:        mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM);
1.160     ad        459:        softnet_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
1.136     ad        460:        cv_init(&socurkva_cv, "sokva");
1.205     bouyer    461:        cv_init(&pendfree_thread_cv, "sopendfr");
1.166     ad        462:        soinit2();
1.136     ad        463:
1.119     yamt      464:        /* Set the initial adjusted socket buffer size. */
                    465:        if (sb_max_set(sb_max))
                    466:                panic("bad initial sb_max value: %lu", sb_max);
                    467:
1.191     elad      468:        socket_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
                    469:            socket_listener_cb, NULL);
1.119     yamt      470: }
                    471:
1.205     bouyer    472: void
                    473: soinit1(void)
                    474: {
                    475:        int error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL,
                    476:            sopendfree_thread, NULL, &sopendfree_lwp, "sopendfree");
                    477:        if (error)
                    478:                panic("soinit1 %d", error);
                    479: }
                    480:
1.1       cgd       481: /*
                    482:  * Socket operation routines.
                    483:  * These routines are called by the routines in
                    484:  * sys_socket.c or from a system process, and
                    485:  * implement the semantics of socket operations by
                    486:  * switching out to the protocol specific routines.
                    487:  */
                    488: /*ARGSUSED*/
1.3       andrew    489: int
1.160     ad        490: socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l,
                    491:         struct socket *lockso)
1.1       cgd       492: {
1.99      matt      493:        const struct protosw    *prp;
1.54      lukem     494:        struct socket   *so;
1.115     yamt      495:        uid_t           uid;
1.160     ad        496:        int             error;
                    497:        kmutex_t        *lock;
1.1       cgd       498:
1.132     elad      499:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET,
                    500:            KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type),
                    501:            KAUTH_ARG(proto));
1.140     dyoung    502:        if (error != 0)
                    503:                return error;
1.127     elad      504:
1.1       cgd       505:        if (proto)
                    506:                prp = pffindproto(dom, proto, type);
                    507:        else
                    508:                prp = pffindtype(dom, type);
1.140     dyoung    509:        if (prp == NULL) {
1.120     ginsbach  510:                /* no support for domain */
                    511:                if (pffinddomain(dom) == 0)
1.140     dyoung    512:                        return EAFNOSUPPORT;
1.120     ginsbach  513:                /* no support for socket type */
                    514:                if (proto == 0 && type != 0)
1.140     dyoung    515:                        return EPROTOTYPE;
                    516:                return EPROTONOSUPPORT;
1.120     ginsbach  517:        }
1.140     dyoung    518:        if (prp->pr_usrreq == NULL)
                    519:                return EPROTONOSUPPORT;
1.1       cgd       520:        if (prp->pr_type != type)
1.140     dyoung    521:                return EPROTOTYPE;
1.160     ad        522:
                    523:        so = soget(true);
1.1       cgd       524:        so->so_type = type;
                    525:        so->so_proto = prp;
1.33      matt      526:        so->so_send = sosend;
                    527:        so->so_receive = soreceive;
1.78      matt      528: #ifdef MBUFTRACE
                    529:        so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner;
                    530:        so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner;
                    531:        so->so_mowner = &prp->pr_domain->dom_mowner;
                    532: #endif
1.138     rmind     533:        uid = kauth_cred_geteuid(l->l_cred);
1.115     yamt      534:        so->so_uidinfo = uid_find(uid);
1.168     yamt      535:        so->so_cpid = l->l_proc->p_pid;
1.160     ad        536:        if (lockso != NULL) {
                    537:                /* Caller wants us to share a lock. */
                    538:                lock = lockso->so_lock;
                    539:                so->so_lock = lock;
                    540:                mutex_obj_hold(lock);
                    541:                mutex_enter(lock);
                    542:        } else {
                    543:                /* Lock assigned and taken during PRU_ATTACH. */
                    544:        }
1.140     dyoung    545:        error = (*prp->pr_usrreq)(so, PRU_ATTACH, NULL,
                    546:            (struct mbuf *)(long)proto, NULL, l);
1.160     ad        547:        KASSERT(solocked(so));
1.140     dyoung    548:        if (error != 0) {
1.1       cgd       549:                so->so_state |= SS_NOFDREF;
                    550:                sofree(so);
1.140     dyoung    551:                return error;
1.1       cgd       552:        }
1.198     elad      553:        so->so_cred = kauth_cred_dup(l->l_cred);
1.160     ad        554:        sounlock(so);
1.1       cgd       555:        *aso = so;
1.140     dyoung    556:        return 0;
1.1       cgd       557: }
                    558:
1.142     dyoung    559: /* On success, write file descriptor to fdout and return zero.  On
                    560:  * failure, return non-zero; *fdout will be undefined.
                    561:  */
                    562: int
                    563: fsocreate(int domain, struct socket **sop, int type, int protocol,
                    564:     struct lwp *l, int *fdout)
                    565: {
                    566:        struct socket   *so;
                    567:        struct file     *fp;
                    568:        int             fd, error;
1.204     christos  569:        int             flags = type & SOCK_FLAGS_MASK;
1.142     dyoung    570:
1.204     christos  571:        type &= ~SOCK_FLAGS_MASK;
1.155     ad        572:        if ((error = fd_allocfile(&fp, &fd)) != 0)
1.204     christos  573:                return error;
                    574:        fd_set_exclose(l, fd, (flags & SOCK_CLOEXEC) != 0);
1.207     christos  575:        fp->f_flag = FREAD|FWRITE|((flags & SOCK_NONBLOCK) ? FNONBLOCK : 0)|
                    576:            ((flags & SOCK_NOSIGPIPE) ? FNOSIGPIPE : 0);
1.142     dyoung    577:        fp->f_type = DTYPE_SOCKET;
                    578:        fp->f_ops = &socketops;
1.160     ad        579:        error = socreate(domain, &so, type, protocol, l, NULL);
1.142     dyoung    580:        if (error != 0) {
1.155     ad        581:                fd_abort(curproc, fp, fd);
1.142     dyoung    582:        } else {
                    583:                if (sop != NULL)
                    584:                        *sop = so;
                    585:                fp->f_data = so;
1.155     ad        586:                fd_affix(curproc, fp, fd);
1.142     dyoung    587:                *fdout = fd;
                    588:        }
                    589:        return error;
                    590: }
                    591:
1.3       andrew    592: int
1.190     dyoung    593: sofamily(const struct socket *so)
                    594: {
                    595:        const struct protosw *pr;
                    596:        const struct domain *dom;
                    597:
                    598:        if ((pr = so->so_proto) == NULL)
                    599:                return AF_UNSPEC;
                    600:        if ((dom = pr->pr_domain) == NULL)
                    601:                return AF_UNSPEC;
                    602:        return dom->dom_family;
                    603: }
                    604:
                    605: int
1.114     christos  606: sobind(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1       cgd       607: {
1.160     ad        608:        int     error;
1.1       cgd       609:
1.160     ad        610:        solock(so);
1.140     dyoung    611:        error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, NULL, nam, NULL, l);
1.160     ad        612:        sounlock(so);
1.140     dyoung    613:        return error;
1.1       cgd       614: }
                    615:
1.3       andrew    616: int
1.150     elad      617: solisten(struct socket *so, int backlog, struct lwp *l)
1.1       cgd       618: {
1.160     ad        619:        int     error;
1.1       cgd       620:
1.160     ad        621:        solock(so);
1.158     ad        622:        if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163     ad        623:            SS_ISDISCONNECTING)) != 0) {
                    624:                sounlock(so);
1.158     ad        625:                return (EOPNOTSUPP);
1.163     ad        626:        }
1.140     dyoung    627:        error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, NULL,
1.150     elad      628:            NULL, NULL, l);
1.140     dyoung    629:        if (error != 0) {
1.160     ad        630:                sounlock(so);
1.140     dyoung    631:                return error;
1.1       cgd       632:        }
1.63      matt      633:        if (TAILQ_EMPTY(&so->so_q))
1.1       cgd       634:                so->so_options |= SO_ACCEPTCONN;
                    635:        if (backlog < 0)
                    636:                backlog = 0;
1.49      jonathan  637:        so->so_qlimit = min(backlog, somaxconn);
1.160     ad        638:        sounlock(so);
1.140     dyoung    639:        return 0;
1.1       cgd       640: }
                    641:
1.21      christos  642: void
1.54      lukem     643: sofree(struct socket *so)
1.1       cgd       644: {
1.161     ad        645:        u_int refs;
1.1       cgd       646:
1.160     ad        647:        KASSERT(solocked(so));
                    648:
                    649:        if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
                    650:                sounlock(so);
1.1       cgd       651:                return;
1.160     ad        652:        }
1.43      mycroft   653:        if (so->so_head) {
                    654:                /*
                    655:                 * We must not decommission a socket that's on the accept(2)
                    656:                 * queue.  If we do, then accept(2) may hang after select(2)
                    657:                 * indicated that the listening socket was ready.
                    658:                 */
1.160     ad        659:                if (!soqremque(so, 0)) {
                    660:                        sounlock(so);
1.43      mycroft   661:                        return;
1.160     ad        662:                }
1.43      mycroft   663:        }
1.98      christos  664:        if (so->so_rcv.sb_hiwat)
1.110     christos  665:                (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98      christos  666:                    RLIM_INFINITY);
                    667:        if (so->so_snd.sb_hiwat)
1.110     christos  668:                (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98      christos  669:                    RLIM_INFINITY);
                    670:        sbrelease(&so->so_snd, so);
1.160     ad        671:        KASSERT(!cv_has_waiters(&so->so_cv));
                    672:        KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
                    673:        KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1       cgd       674:        sorflush(so);
1.161     ad        675:        refs = so->so_aborting; /* XXX */
1.177     ad        676:        /* Remove acccept filter if one is present. */
1.170     tls       677:        if (so->so_accf != NULL)
1.177     ad        678:                (void)accept_filt_clear(so);
1.160     ad        679:        sounlock(so);
1.161     ad        680:        if (refs == 0)          /* XXX */
                    681:                soput(so);
1.1       cgd       682: }
                    683:
                    684: /*
                    685:  * Close a socket on last file table reference removal.
                    686:  * Initiate disconnect if connected.
                    687:  * Free socket when disconnect complete.
                    688:  */
1.3       andrew    689: int
1.54      lukem     690: soclose(struct socket *so)
1.1       cgd       691: {
1.54      lukem     692:        struct socket   *so2;
1.160     ad        693:        int             error;
                    694:        int             error2;
1.1       cgd       695:
1.54      lukem     696:        error = 0;
1.160     ad        697:        solock(so);
1.1       cgd       698:        if (so->so_options & SO_ACCEPTCONN) {
1.172     ad        699:                for (;;) {
                    700:                        if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.160     ad        701:                                KASSERT(solocked2(so, so2));
                    702:                                (void) soqremque(so2, 0);
                    703:                                /* soabort drops the lock. */
                    704:                                (void) soabort(so2);
                    705:                                solock(so);
1.172     ad        706:                                continue;
1.160     ad        707:                        }
1.172     ad        708:                        if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.160     ad        709:                                KASSERT(solocked2(so, so2));
                    710:                                (void) soqremque(so2, 1);
                    711:                                /* soabort drops the lock. */
                    712:                                (void) soabort(so2);
                    713:                                solock(so);
1.172     ad        714:                                continue;
1.160     ad        715:                        }
1.172     ad        716:                        break;
                    717:                }
1.1       cgd       718:        }
                    719:        if (so->so_pcb == 0)
                    720:                goto discard;
                    721:        if (so->so_state & SS_ISCONNECTED) {
                    722:                if ((so->so_state & SS_ISDISCONNECTING) == 0) {
                    723:                        error = sodisconnect(so);
                    724:                        if (error)
                    725:                                goto drop;
                    726:                }
                    727:                if (so->so_options & SO_LINGER) {
1.206     christos  728:                        if ((so->so_state & (SS_ISDISCONNECTING|SS_NBIO)) ==
                    729:                            (SS_ISDISCONNECTING|SS_NBIO))
1.1       cgd       730:                                goto drop;
1.21      christos  731:                        while (so->so_state & SS_ISCONNECTED) {
1.185     yamt      732:                                error = sowait(so, true, so->so_linger * hz);
1.21      christos  733:                                if (error)
1.1       cgd       734:                                        break;
1.21      christos  735:                        }
1.1       cgd       736:                }
                    737:        }
1.54      lukem     738:  drop:
1.1       cgd       739:        if (so->so_pcb) {
1.160     ad        740:                error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
1.140     dyoung    741:                    NULL, NULL, NULL, NULL);
1.1       cgd       742:                if (error == 0)
                    743:                        error = error2;
                    744:        }
1.54      lukem     745:  discard:
1.1       cgd       746:        if (so->so_state & SS_NOFDREF)
                    747:                panic("soclose: NOFDREF");
1.198     elad      748:        kauth_cred_free(so->so_cred);
1.1       cgd       749:        so->so_state |= SS_NOFDREF;
                    750:        sofree(so);
                    751:        return (error);
                    752: }
                    753:
                    754: /*
1.160     ad        755:  * Must be called with the socket locked..  Will return with it unlocked.
1.1       cgd       756:  */
1.3       andrew    757: int
1.54      lukem     758: soabort(struct socket *so)
1.1       cgd       759: {
1.161     ad        760:        u_int refs;
1.139     yamt      761:        int error;
1.160     ad        762:
                    763:        KASSERT(solocked(so));
                    764:        KASSERT(so->so_head == NULL);
1.1       cgd       765:
1.161     ad        766:        so->so_aborting++;              /* XXX */
1.140     dyoung    767:        error = (*so->so_proto->pr_usrreq)(so, PRU_ABORT, NULL,
                    768:            NULL, NULL, NULL);
1.161     ad        769:        refs = --so->so_aborting;       /* XXX */
1.164     drochner  770:        if (error || (refs == 0)) {
1.139     yamt      771:                sofree(so);
1.160     ad        772:        } else {
                    773:                sounlock(so);
1.139     yamt      774:        }
                    775:        return error;
1.1       cgd       776: }
                    777:
1.3       andrew    778: int
1.54      lukem     779: soaccept(struct socket *so, struct mbuf *nam)
1.1       cgd       780: {
1.160     ad        781:        int     error;
                    782:
                    783:        KASSERT(solocked(so));
1.1       cgd       784:
1.54      lukem     785:        error = 0;
1.1       cgd       786:        if ((so->so_state & SS_NOFDREF) == 0)
                    787:                panic("soaccept: !NOFDREF");
                    788:        so->so_state &= ~SS_NOFDREF;
1.55      thorpej   789:        if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
                    790:            (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.41      mycroft   791:                error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT,
1.140     dyoung    792:                    NULL, nam, NULL, NULL);
1.41      mycroft   793:        else
1.53      itojun    794:                error = ECONNABORTED;
1.52      itojun    795:
1.1       cgd       796:        return (error);
                    797: }
                    798:
1.3       andrew    799: int
1.114     christos  800: soconnect(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1       cgd       801: {
1.160     ad        802:        int             error;
                    803:
                    804:        KASSERT(solocked(so));
1.1       cgd       805:
                    806:        if (so->so_options & SO_ACCEPTCONN)
                    807:                return (EOPNOTSUPP);
                    808:        /*
                    809:         * If protocol is connection-based, can only connect once.
                    810:         * Otherwise, if connected, try to disconnect first.
                    811:         * This allows user to disconnect by connecting to, e.g.,
                    812:         * a null address.
                    813:         */
                    814:        if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
                    815:            ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
                    816:            (error = sodisconnect(so))))
                    817:                error = EISCONN;
                    818:        else
                    819:                error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
1.140     dyoung    820:                    NULL, nam, NULL, l);
1.1       cgd       821:        return (error);
                    822: }
                    823:
1.3       andrew    824: int
1.54      lukem     825: soconnect2(struct socket *so1, struct socket *so2)
1.1       cgd       826: {
1.160     ad        827:        int     error;
                    828:
                    829:        KASSERT(solocked2(so1, so2));
1.1       cgd       830:
1.22      mycroft   831:        error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
1.140     dyoung    832:            NULL, (struct mbuf *)so2, NULL, NULL);
1.1       cgd       833:        return (error);
                    834: }
                    835:
1.3       andrew    836: int
1.54      lukem     837: sodisconnect(struct socket *so)
1.1       cgd       838: {
1.160     ad        839:        int     error;
                    840:
                    841:        KASSERT(solocked(so));
1.1       cgd       842:
                    843:        if ((so->so_state & SS_ISCONNECTED) == 0) {
                    844:                error = ENOTCONN;
1.160     ad        845:        } else if (so->so_state & SS_ISDISCONNECTING) {
1.1       cgd       846:                error = EALREADY;
1.160     ad        847:        } else {
                    848:                error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
                    849:                    NULL, NULL, NULL, NULL);
1.1       cgd       850:        }
                    851:        return (error);
                    852: }
                    853:
1.15      mycroft   854: #define        SBLOCKWAIT(f)   (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1       cgd       855: /*
                    856:  * Send on a socket.
                    857:  * If send must go all at once and message is larger than
                    858:  * send buffering, then hard error.
                    859:  * Lock against other senders.
                    860:  * If must go all at once and not enough room now, then
                    861:  * inform user that this would block and do nothing.
                    862:  * Otherwise, if nonblocking, send as much as possible.
                    863:  * The data to be sent is described by "uio" if nonzero,
                    864:  * otherwise by the mbuf chain "top" (which must be null
                    865:  * if uio is not).  Data provided in mbuf chain must be small
                    866:  * enough to send all at once.
                    867:  *
                    868:  * Returns nonzero on error, timeout or signal; callers
                    869:  * must check for short counts if EINTR/ERESTART are returned.
                    870:  * Data and control buffers are freed on return.
                    871:  */
1.3       andrew    872: int
1.54      lukem     873: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
1.114     christos  874:        struct mbuf *control, int flags, struct lwp *l)
1.1       cgd       875: {
1.54      lukem     876:        struct mbuf     **mp, *m;
1.114     christos  877:        struct proc     *p;
1.58      jdolecek  878:        long            space, len, resid, clen, mlen;
                    879:        int             error, s, dontroute, atomic;
1.196     dsl       880:        short           wakeup_state = 0;
1.54      lukem     881:
1.114     christos  882:        p = l->l_proc;
1.160     ad        883:        clen = 0;
1.64      thorpej   884:
1.160     ad        885:        /*
                    886:         * solock() provides atomicity of access.  splsoftnet() prevents
                    887:         * protocol processing soft interrupts from interrupting us and
                    888:         * blocking (expensive).
                    889:         */
                    890:        s = splsoftnet();
                    891:        solock(so);
1.54      lukem     892:        atomic = sosendallatonce(so) || top;
1.1       cgd       893:        if (uio)
                    894:                resid = uio->uio_resid;
                    895:        else
                    896:                resid = top->m_pkthdr.len;
1.7       cgd       897:        /*
                    898:         * In theory resid should be unsigned.
                    899:         * However, space must be signed, as it might be less than 0
                    900:         * if we over-committed, and we must use a signed comparison
                    901:         * of space and resid.  On the other hand, a negative resid
                    902:         * causes us to loop sending 0-length segments to the protocol.
                    903:         */
1.29      mycroft   904:        if (resid < 0) {
                    905:                error = EINVAL;
                    906:                goto out;
                    907:        }
1.1       cgd       908:        dontroute =
                    909:            (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
                    910:            (so->so_proto->pr_flags & PR_ATOMIC);
1.165     christos  911:        l->l_ru.ru_msgsnd++;
1.1       cgd       912:        if (control)
                    913:                clen = control->m_len;
1.54      lukem     914:  restart:
1.21      christos  915:        if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1       cgd       916:                goto out;
                    917:        do {
1.160     ad        918:                if (so->so_state & SS_CANTSENDMORE) {
                    919:                        error = EPIPE;
                    920:                        goto release;
                    921:                }
1.48      thorpej   922:                if (so->so_error) {
                    923:                        error = so->so_error;
                    924:                        so->so_error = 0;
                    925:                        goto release;
                    926:                }
1.1       cgd       927:                if ((so->so_state & SS_ISCONNECTED) == 0) {
                    928:                        if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
                    929:                                if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1.160     ad        930:                                    !(resid == 0 && clen != 0)) {
                    931:                                        error = ENOTCONN;
                    932:                                        goto release;
                    933:                                }
                    934:                        } else if (addr == 0) {
                    935:                                error = EDESTADDRREQ;
                    936:                                goto release;
                    937:                        }
1.1       cgd       938:                }
                    939:                space = sbspace(&so->so_snd);
                    940:                if (flags & MSG_OOB)
                    941:                        space += 1024;
1.21      christos  942:                if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160     ad        943:                    clen > so->so_snd.sb_hiwat) {
                    944:                        error = EMSGSIZE;
                    945:                        goto release;
                    946:                }
1.96      mycroft   947:                if (space < resid + clen &&
1.1       cgd       948:                    (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.206     christos  949:                        if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1.160     ad        950:                                error = EWOULDBLOCK;
                    951:                                goto release;
                    952:                        }
1.1       cgd       953:                        sbunlock(&so->so_snd);
1.196     dsl       954:                        if (wakeup_state & SS_RESTARTSYS) {
                    955:                                error = ERESTART;
                    956:                                goto out;
                    957:                        }
1.1       cgd       958:                        error = sbwait(&so->so_snd);
                    959:                        if (error)
                    960:                                goto out;
1.196     dsl       961:                        wakeup_state = so->so_state;
1.1       cgd       962:                        goto restart;
                    963:                }
1.196     dsl       964:                wakeup_state = 0;
1.1       cgd       965:                mp = &top;
                    966:                space -= clen;
                    967:                do {
1.45      tv        968:                        if (uio == NULL) {
                    969:                                /*
                    970:                                 * Data is prepackaged in "top".
                    971:                                 */
                    972:                                resid = 0;
                    973:                                if (flags & MSG_EOR)
                    974:                                        top->m_flags |= M_EOR;
                    975:                        } else do {
1.160     ad        976:                                sounlock(so);
                    977:                                splx(s);
1.144     dyoung    978:                                if (top == NULL) {
1.78      matt      979:                                        m = m_gethdr(M_WAIT, MT_DATA);
1.45      tv        980:                                        mlen = MHLEN;
                    981:                                        m->m_pkthdr.len = 0;
1.140     dyoung    982:                                        m->m_pkthdr.rcvif = NULL;
1.45      tv        983:                                } else {
1.78      matt      984:                                        m = m_get(M_WAIT, MT_DATA);
1.45      tv        985:                                        mlen = MLEN;
                    986:                                }
1.78      matt      987:                                MCLAIM(m, so->so_snd.sb_mowner);
1.121     yamt      988:                                if (sock_loan_thresh >= 0 &&
                    989:                                    uio->uio_iov->iov_len >= sock_loan_thresh &&
                    990:                                    space >= sock_loan_thresh &&
1.64      thorpej   991:                                    (len = sosend_loan(so, uio, m,
                    992:                                                       space)) != 0) {
                    993:                                        SOSEND_COUNTER_INCR(&sosend_loan_big);
                    994:                                        space -= len;
                    995:                                        goto have_data;
                    996:                                }
1.45      tv        997:                                if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64      thorpej   998:                                        SOSEND_COUNTER_INCR(&sosend_copy_big);
1.201     oki       999:                                        m_clget(m, M_DONTWAIT);
1.45      tv       1000:                                        if ((m->m_flags & M_EXT) == 0)
                   1001:                                                goto nopages;
                   1002:                                        mlen = MCLBYTES;
                   1003:                                        if (atomic && top == 0) {
1.58      jdolecek 1004:                                                len = lmin(MCLBYTES - max_hdr,
1.54      lukem    1005:                                                    resid);
1.45      tv       1006:                                                m->m_data += max_hdr;
                   1007:                                        } else
1.58      jdolecek 1008:                                                len = lmin(MCLBYTES, resid);
1.45      tv       1009:                                        space -= len;
                   1010:                                } else {
1.64      thorpej  1011:  nopages:
                   1012:                                        SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58      jdolecek 1013:                                        len = lmin(lmin(mlen, resid), space);
1.45      tv       1014:                                        space -= len;
                   1015:                                        /*
                   1016:                                         * For datagram protocols, leave room
                   1017:                                         * for protocol headers in first mbuf.
                   1018:                                         */
                   1019:                                        if (atomic && top == 0 && len < mlen)
                   1020:                                                MH_ALIGN(m, len);
                   1021:                                }
1.144     dyoung   1022:                                error = uiomove(mtod(m, void *), (int)len, uio);
1.64      thorpej  1023:  have_data:
1.45      tv       1024:                                resid = uio->uio_resid;
                   1025:                                m->m_len = len;
                   1026:                                *mp = m;
                   1027:                                top->m_pkthdr.len += len;
1.160     ad       1028:                                s = splsoftnet();
                   1029:                                solock(so);
1.144     dyoung   1030:                                if (error != 0)
1.45      tv       1031:                                        goto release;
                   1032:                                mp = &m->m_next;
                   1033:                                if (resid <= 0) {
                   1034:                                        if (flags & MSG_EOR)
                   1035:                                                top->m_flags |= M_EOR;
                   1036:                                        break;
                   1037:                                }
                   1038:                        } while (space > 0 && atomic);
1.108     perry    1039:
1.160     ad       1040:                        if (so->so_state & SS_CANTSENDMORE) {
                   1041:                                error = EPIPE;
                   1042:                                goto release;
                   1043:                        }
1.45      tv       1044:                        if (dontroute)
                   1045:                                so->so_options |= SO_DONTROUTE;
                   1046:                        if (resid > 0)
                   1047:                                so->so_state |= SS_MORETOCOME;
1.46      sommerfe 1048:                        error = (*so->so_proto->pr_usrreq)(so,
                   1049:                            (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
1.160     ad       1050:                            top, addr, control, curlwp);
1.45      tv       1051:                        if (dontroute)
                   1052:                                so->so_options &= ~SO_DONTROUTE;
                   1053:                        if (resid > 0)
                   1054:                                so->so_state &= ~SS_MORETOCOME;
                   1055:                        clen = 0;
1.144     dyoung   1056:                        control = NULL;
                   1057:                        top = NULL;
1.45      tv       1058:                        mp = &top;
1.144     dyoung   1059:                        if (error != 0)
1.1       cgd      1060:                                goto release;
                   1061:                } while (resid && space > 0);
                   1062:        } while (resid);
                   1063:
1.54      lukem    1064:  release:
1.1       cgd      1065:        sbunlock(&so->so_snd);
1.54      lukem    1066:  out:
1.160     ad       1067:        sounlock(so);
                   1068:        splx(s);
1.1       cgd      1069:        if (top)
                   1070:                m_freem(top);
                   1071:        if (control)
                   1072:                m_freem(control);
                   1073:        return (error);
                   1074: }
                   1075:
                   1076: /*
1.159     ad       1077:  * Following replacement or removal of the first mbuf on the first
                   1078:  * mbuf chain of a socket buffer, push necessary state changes back
                   1079:  * into the socket buffer so that other consumers see the values
                   1080:  * consistently.  'nextrecord' is the callers locally stored value of
                   1081:  * the original value of sb->sb_mb->m_nextpkt which must be restored
                   1082:  * when the lead mbuf changes.  NOTE: 'nextrecord' may be NULL.
                   1083:  */
                   1084: static void
                   1085: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
                   1086: {
                   1087:
1.160     ad       1088:        KASSERT(solocked(sb->sb_so));
                   1089:
1.159     ad       1090:        /*
                   1091:         * First, update for the new value of nextrecord.  If necessary,
                   1092:         * make it the first record.
                   1093:         */
                   1094:        if (sb->sb_mb != NULL)
                   1095:                sb->sb_mb->m_nextpkt = nextrecord;
                   1096:        else
                   1097:                sb->sb_mb = nextrecord;
                   1098:
                   1099:         /*
                   1100:          * Now update any dependent socket buffer fields to reflect
                   1101:          * the new state.  This is an inline of SB_EMPTY_FIXUP, with
                   1102:          * the addition of a second clause that takes care of the
                   1103:          * case where sb_mb has been updated, but remains the last
                   1104:          * record.
                   1105:          */
                   1106:         if (sb->sb_mb == NULL) {
                   1107:                 sb->sb_mbtail = NULL;
                   1108:                 sb->sb_lastrecord = NULL;
                   1109:         } else if (sb->sb_mb->m_nextpkt == NULL)
                   1110:                 sb->sb_lastrecord = sb->sb_mb;
                   1111: }
                   1112:
                   1113: /*
1.1       cgd      1114:  * Implement receive operations on a socket.
                   1115:  * We depend on the way that records are added to the sockbuf
                   1116:  * by sbappend*.  In particular, each record (mbufs linked through m_next)
                   1117:  * must begin with an address if the protocol so specifies,
                   1118:  * followed by an optional mbuf or mbufs containing ancillary data,
                   1119:  * and then zero or more mbufs of data.
                   1120:  * In order to avoid blocking network interrupts for the entire time here,
                   1121:  * we splx() while doing the actual copy to user space.
                   1122:  * Although the sockbuf is locked, new data may still be appended,
                   1123:  * and thus we must maintain consistency of the sockbuf during that time.
                   1124:  *
                   1125:  * The caller may receive the data as a single mbuf chain by supplying
                   1126:  * an mbuf **mp0 for use in returning the chain.  The uio is then used
                   1127:  * only for the count in uio_resid.
                   1128:  */
1.3       andrew   1129: int
1.54      lukem    1130: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
                   1131:        struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1       cgd      1132: {
1.116     yamt     1133:        struct lwp *l = curlwp;
1.160     ad       1134:        struct mbuf     *m, **mp, *mt;
1.146     dyoung   1135:        int atomic, flags, len, error, s, offset, moff, type, orig_resid;
1.99      matt     1136:        const struct protosw    *pr;
1.54      lukem    1137:        struct mbuf     *nextrecord;
1.67      he       1138:        int             mbuf_removed = 0;
1.146     dyoung   1139:        const struct domain *dom;
1.196     dsl      1140:        short           wakeup_state = 0;
1.64      thorpej  1141:
1.54      lukem    1142:        pr = so->so_proto;
1.146     dyoung   1143:        atomic = pr->pr_flags & PR_ATOMIC;
                   1144:        dom = pr->pr_domain;
1.1       cgd      1145:        mp = mp0;
1.54      lukem    1146:        type = 0;
                   1147:        orig_resid = uio->uio_resid;
1.102     jonathan 1148:
1.144     dyoung   1149:        if (paddr != NULL)
                   1150:                *paddr = NULL;
                   1151:        if (controlp != NULL)
                   1152:                *controlp = NULL;
                   1153:        if (flagsp != NULL)
1.1       cgd      1154:                flags = *flagsp &~ MSG_EOR;
                   1155:        else
                   1156:                flags = 0;
1.66      enami    1157:
1.1       cgd      1158:        if (flags & MSG_OOB) {
                   1159:                m = m_get(M_WAIT, MT_DATA);
1.160     ad       1160:                solock(so);
1.17      cgd      1161:                error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
1.140     dyoung   1162:                    (struct mbuf *)(long)(flags & MSG_PEEK), NULL, l);
1.160     ad       1163:                sounlock(so);
1.1       cgd      1164:                if (error)
                   1165:                        goto bad;
                   1166:                do {
1.134     christos 1167:                        error = uiomove(mtod(m, void *),
1.1       cgd      1168:                            (int) min(uio->uio_resid, m->m_len), uio);
                   1169:                        m = m_free(m);
1.144     dyoung   1170:                } while (uio->uio_resid > 0 && error == 0 && m);
1.54      lukem    1171:  bad:
1.144     dyoung   1172:                if (m != NULL)
1.1       cgd      1173:                        m_freem(m);
1.144     dyoung   1174:                return error;
1.1       cgd      1175:        }
1.144     dyoung   1176:        if (mp != NULL)
1.140     dyoung   1177:                *mp = NULL;
1.160     ad       1178:
                   1179:        /*
                   1180:         * solock() provides atomicity of access.  splsoftnet() prevents
                   1181:         * protocol processing soft interrupts from interrupting us and
                   1182:         * blocking (expensive).
                   1183:         */
                   1184:        s = splsoftnet();
                   1185:        solock(so);
1.1       cgd      1186:        if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
1.140     dyoung   1187:                (*pr->pr_usrreq)(so, PRU_RCVD, NULL, NULL, NULL, l);
1.1       cgd      1188:
1.54      lukem    1189:  restart:
1.160     ad       1190:        if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
                   1191:                sounlock(so);
                   1192:                splx(s);
1.144     dyoung   1193:                return error;
1.160     ad       1194:        }
1.1       cgd      1195:
                   1196:        m = so->so_rcv.sb_mb;
                   1197:        /*
                   1198:         * If we have less data than requested, block awaiting more
                   1199:         * (subject to any timeout) if:
1.15      mycroft  1200:         *   1. the current count is less than the low water mark,
1.1       cgd      1201:         *   2. MSG_WAITALL is set, and it is possible to do the entire
1.15      mycroft  1202:         *      receive operation at once if we block (resid <= hiwat), or
                   1203:         *   3. MSG_DONTWAIT is not set.
1.1       cgd      1204:         * If MSG_WAITALL is set but resid is larger than the receive buffer,
                   1205:         * we have to do the receive in sections, and thus risk returning
                   1206:         * a short count if a timeout or signal occurs after we start.
                   1207:         */
1.144     dyoung   1208:        if (m == NULL ||
                   1209:            ((flags & MSG_DONTWAIT) == 0 &&
                   1210:             so->so_rcv.sb_cc < uio->uio_resid &&
                   1211:             (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
                   1212:              ((flags & MSG_WAITALL) &&
                   1213:               uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146     dyoung   1214:             m->m_nextpkt == NULL && !atomic)) {
1.1       cgd      1215: #ifdef DIAGNOSTIC
1.144     dyoung   1216:                if (m == NULL && so->so_rcv.sb_cc)
1.1       cgd      1217:                        panic("receive 1");
                   1218: #endif
                   1219:                if (so->so_error) {
1.144     dyoung   1220:                        if (m != NULL)
1.15      mycroft  1221:                                goto dontblock;
1.1       cgd      1222:                        error = so->so_error;
                   1223:                        if ((flags & MSG_PEEK) == 0)
                   1224:                                so->so_error = 0;
                   1225:                        goto release;
                   1226:                }
                   1227:                if (so->so_state & SS_CANTRCVMORE) {
1.144     dyoung   1228:                        if (m != NULL)
1.15      mycroft  1229:                                goto dontblock;
1.1       cgd      1230:                        else
                   1231:                                goto release;
                   1232:                }
1.144     dyoung   1233:                for (; m != NULL; m = m->m_next)
1.1       cgd      1234:                        if (m->m_type == MT_OOBDATA  || (m->m_flags & M_EOR)) {
                   1235:                                m = so->so_rcv.sb_mb;
                   1236:                                goto dontblock;
                   1237:                        }
                   1238:                if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
                   1239:                    (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
                   1240:                        error = ENOTCONN;
                   1241:                        goto release;
                   1242:                }
                   1243:                if (uio->uio_resid == 0)
                   1244:                        goto release;
1.206     christos 1245:                if ((so->so_state & SS_NBIO) ||
                   1246:                    (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1.1       cgd      1247:                        error = EWOULDBLOCK;
                   1248:                        goto release;
                   1249:                }
1.69      thorpej  1250:                SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
                   1251:                SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1       cgd      1252:                sbunlock(&so->so_rcv);
1.196     dsl      1253:                if (wakeup_state & SS_RESTARTSYS)
                   1254:                        error = ERESTART;
                   1255:                else
                   1256:                        error = sbwait(&so->so_rcv);
1.160     ad       1257:                if (error != 0) {
                   1258:                        sounlock(so);
                   1259:                        splx(s);
1.144     dyoung   1260:                        return error;
1.160     ad       1261:                }
1.196     dsl      1262:                wakeup_state = so->so_state;
1.1       cgd      1263:                goto restart;
                   1264:        }
1.54      lukem    1265:  dontblock:
1.69      thorpej  1266:        /*
                   1267:         * On entry here, m points to the first record of the socket buffer.
1.159     ad       1268:         * From this point onward, we maintain 'nextrecord' as a cache of the
                   1269:         * pointer to the next record in the socket buffer.  We must keep the
                   1270:         * various socket buffer pointers and local stack versions of the
                   1271:         * pointers in sync, pushing out modifications before dropping the
1.160     ad       1272:         * socket lock, and re-reading them when picking it up.
1.159     ad       1273:         *
                   1274:         * Otherwise, we will race with the network stack appending new data
                   1275:         * or records onto the socket buffer by using inconsistent/stale
                   1276:         * versions of the field, possibly resulting in socket buffer
                   1277:         * corruption.
                   1278:         *
                   1279:         * By holding the high-level sblock(), we prevent simultaneous
                   1280:         * readers from pulling off the front of the socket buffer.
1.69      thorpej  1281:         */
1.144     dyoung   1282:        if (l != NULL)
1.157     ad       1283:                l->l_ru.ru_msgrcv++;
1.69      thorpej  1284:        KASSERT(m == so->so_rcv.sb_mb);
                   1285:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
                   1286:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1       cgd      1287:        nextrecord = m->m_nextpkt;
                   1288:        if (pr->pr_flags & PR_ADDR) {
                   1289: #ifdef DIAGNOSTIC
                   1290:                if (m->m_type != MT_SONAME)
                   1291:                        panic("receive 1a");
                   1292: #endif
1.3       andrew   1293:                orig_resid = 0;
1.1       cgd      1294:                if (flags & MSG_PEEK) {
                   1295:                        if (paddr)
                   1296:                                *paddr = m_copy(m, 0, m->m_len);
                   1297:                        m = m->m_next;
                   1298:                } else {
                   1299:                        sbfree(&so->so_rcv, m);
1.67      he       1300:                        mbuf_removed = 1;
1.144     dyoung   1301:                        if (paddr != NULL) {
1.1       cgd      1302:                                *paddr = m;
                   1303:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1304:                                m->m_next = NULL;
1.1       cgd      1305:                                m = so->so_rcv.sb_mb;
                   1306:                        } else {
                   1307:                                MFREE(m, so->so_rcv.sb_mb);
                   1308:                                m = so->so_rcv.sb_mb;
                   1309:                        }
1.159     ad       1310:                        sbsync(&so->so_rcv, nextrecord);
1.1       cgd      1311:                }
                   1312:        }
1.159     ad       1313:
                   1314:        /*
                   1315:         * Process one or more MT_CONTROL mbufs present before any data mbufs
                   1316:         * in the first mbuf chain on the socket buffer.  If MSG_PEEK, we
                   1317:         * just copy the data; if !MSG_PEEK, we call into the protocol to
                   1318:         * perform externalization (or freeing if controlp == NULL).
                   1319:         */
                   1320:        if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
                   1321:                struct mbuf *cm = NULL, *cmn;
                   1322:                struct mbuf **cme = &cm;
                   1323:
                   1324:                do {
                   1325:                        if (flags & MSG_PEEK) {
                   1326:                                if (controlp != NULL) {
                   1327:                                        *controlp = m_copy(m, 0, m->m_len);
                   1328:                                        controlp = &(*controlp)->m_next;
                   1329:                                }
                   1330:                                m = m->m_next;
                   1331:                        } else {
                   1332:                                sbfree(&so->so_rcv, m);
1.1       cgd      1333:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1334:                                m->m_next = NULL;
1.159     ad       1335:                                *cme = m;
                   1336:                                cme = &(*cme)->m_next;
1.1       cgd      1337:                                m = so->so_rcv.sb_mb;
1.159     ad       1338:                        }
                   1339:                } while (m != NULL && m->m_type == MT_CONTROL);
                   1340:                if ((flags & MSG_PEEK) == 0)
                   1341:                        sbsync(&so->so_rcv, nextrecord);
                   1342:                for (; cm != NULL; cm = cmn) {
                   1343:                        cmn = cm->m_next;
                   1344:                        cm->m_next = NULL;
                   1345:                        type = mtod(cm, struct cmsghdr *)->cmsg_type;
                   1346:                        if (controlp != NULL) {
                   1347:                                if (dom->dom_externalize != NULL &&
                   1348:                                    type == SCM_RIGHTS) {
1.160     ad       1349:                                        sounlock(so);
1.159     ad       1350:                                        splx(s);
1.204     christos 1351:                                        error = (*dom->dom_externalize)(cm, l,
                   1352:                                            (flags & MSG_CMSG_CLOEXEC) ?
                   1353:                                            O_CLOEXEC : 0);
1.159     ad       1354:                                        s = splsoftnet();
1.160     ad       1355:                                        solock(so);
1.159     ad       1356:                                }
                   1357:                                *controlp = cm;
                   1358:                                while (*controlp != NULL)
                   1359:                                        controlp = &(*controlp)->m_next;
1.1       cgd      1360:                        } else {
1.106     itojun   1361:                                /*
                   1362:                                 * Dispose of any SCM_RIGHTS message that went
                   1363:                                 * through the read path rather than recv.
                   1364:                                 */
1.159     ad       1365:                                if (dom->dom_dispose != NULL &&
                   1366:                                    type == SCM_RIGHTS) {
1.160     ad       1367:                                        sounlock(so);
1.159     ad       1368:                                        (*dom->dom_dispose)(cm);
1.160     ad       1369:                                        solock(so);
1.159     ad       1370:                                }
                   1371:                                m_freem(cm);
1.1       cgd      1372:                        }
                   1373:                }
1.159     ad       1374:                if (m != NULL)
                   1375:                        nextrecord = so->so_rcv.sb_mb->m_nextpkt;
                   1376:                else
                   1377:                        nextrecord = so->so_rcv.sb_mb;
                   1378:                orig_resid = 0;
1.1       cgd      1379:        }
1.69      thorpej  1380:
1.159     ad       1381:        /* If m is non-NULL, we have some data to read. */
                   1382:        if (__predict_true(m != NULL)) {
1.1       cgd      1383:                type = m->m_type;
                   1384:                if (type == MT_OOBDATA)
                   1385:                        flags |= MSG_OOB;
                   1386:        }
1.69      thorpej  1387:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
                   1388:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
                   1389:
1.1       cgd      1390:        moff = 0;
                   1391:        offset = 0;
1.144     dyoung   1392:        while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1       cgd      1393:                if (m->m_type == MT_OOBDATA) {
                   1394:                        if (type != MT_OOBDATA)
                   1395:                                break;
                   1396:                } else if (type == MT_OOBDATA)
                   1397:                        break;
                   1398: #ifdef DIAGNOSTIC
                   1399:                else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
                   1400:                        panic("receive 3");
                   1401: #endif
                   1402:                so->so_state &= ~SS_RCVATMARK;
1.196     dsl      1403:                wakeup_state = 0;
1.1       cgd      1404:                len = uio->uio_resid;
                   1405:                if (so->so_oobmark && len > so->so_oobmark - offset)
                   1406:                        len = so->so_oobmark - offset;
                   1407:                if (len > m->m_len - moff)
                   1408:                        len = m->m_len - moff;
                   1409:                /*
                   1410:                 * If mp is set, just pass back the mbufs.
                   1411:                 * Otherwise copy them out via the uio, then free.
                   1412:                 * Sockbuf must be consistent here (points to current mbuf,
                   1413:                 * it points to next record) when we drop priority;
                   1414:                 * we must note any additions to the sockbuf when we
                   1415:                 * block interrupts again.
                   1416:                 */
1.144     dyoung   1417:                if (mp == NULL) {
1.69      thorpej  1418:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
                   1419:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160     ad       1420:                        sounlock(so);
1.1       cgd      1421:                        splx(s);
1.134     christos 1422:                        error = uiomove(mtod(m, char *) + moff, (int)len, uio);
1.20      mycroft  1423:                        s = splsoftnet();
1.160     ad       1424:                        solock(so);
1.144     dyoung   1425:                        if (error != 0) {
1.67      he       1426:                                /*
                   1427:                                 * If any part of the record has been removed
                   1428:                                 * (such as the MT_SONAME mbuf, which will
                   1429:                                 * happen when PR_ADDR, and thus also
                   1430:                                 * PR_ATOMIC, is set), then drop the entire
                   1431:                                 * record to maintain the atomicity of the
                   1432:                                 * receive operation.
                   1433:                                 *
                   1434:                                 * This avoids a later panic("receive 1a")
                   1435:                                 * when compiled with DIAGNOSTIC.
                   1436:                                 */
1.146     dyoung   1437:                                if (m && mbuf_removed && atomic)
1.67      he       1438:                                        (void) sbdroprecord(&so->so_rcv);
                   1439:
1.57      jdolecek 1440:                                goto release;
1.67      he       1441:                        }
1.1       cgd      1442:                } else
                   1443:                        uio->uio_resid -= len;
                   1444:                if (len == m->m_len - moff) {
                   1445:                        if (m->m_flags & M_EOR)
                   1446:                                flags |= MSG_EOR;
                   1447:                        if (flags & MSG_PEEK) {
                   1448:                                m = m->m_next;
                   1449:                                moff = 0;
                   1450:                        } else {
                   1451:                                nextrecord = m->m_nextpkt;
                   1452:                                sbfree(&so->so_rcv, m);
                   1453:                                if (mp) {
                   1454:                                        *mp = m;
                   1455:                                        mp = &m->m_next;
                   1456:                                        so->so_rcv.sb_mb = m = m->m_next;
1.140     dyoung   1457:                                        *mp = NULL;
1.1       cgd      1458:                                } else {
                   1459:                                        MFREE(m, so->so_rcv.sb_mb);
                   1460:                                        m = so->so_rcv.sb_mb;
                   1461:                                }
1.69      thorpej  1462:                                /*
                   1463:                                 * If m != NULL, we also know that
                   1464:                                 * so->so_rcv.sb_mb != NULL.
                   1465:                                 */
                   1466:                                KASSERT(so->so_rcv.sb_mb == m);
                   1467:                                if (m) {
1.1       cgd      1468:                                        m->m_nextpkt = nextrecord;
1.69      thorpej  1469:                                        if (nextrecord == NULL)
                   1470:                                                so->so_rcv.sb_lastrecord = m;
                   1471:                                } else {
                   1472:                                        so->so_rcv.sb_mb = nextrecord;
1.70      thorpej  1473:                                        SB_EMPTY_FIXUP(&so->so_rcv);
1.69      thorpej  1474:                                }
                   1475:                                SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
                   1476:                                SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1       cgd      1477:                        }
1.144     dyoung   1478:                } else if (flags & MSG_PEEK)
                   1479:                        moff += len;
                   1480:                else {
1.160     ad       1481:                        if (mp != NULL) {
                   1482:                                mt = m_copym(m, 0, len, M_NOWAIT);
                   1483:                                if (__predict_false(mt == NULL)) {
                   1484:                                        sounlock(so);
                   1485:                                        mt = m_copym(m, 0, len, M_WAIT);
                   1486:                                        solock(so);
                   1487:                                }
                   1488:                                *mp = mt;
                   1489:                        }
1.144     dyoung   1490:                        m->m_data += len;
                   1491:                        m->m_len -= len;
                   1492:                        so->so_rcv.sb_cc -= len;
1.1       cgd      1493:                }
                   1494:                if (so->so_oobmark) {
                   1495:                        if ((flags & MSG_PEEK) == 0) {
                   1496:                                so->so_oobmark -= len;
                   1497:                                if (so->so_oobmark == 0) {
                   1498:                                        so->so_state |= SS_RCVATMARK;
                   1499:                                        break;
                   1500:                                }
1.7       cgd      1501:                        } else {
1.1       cgd      1502:                                offset += len;
1.7       cgd      1503:                                if (offset == so->so_oobmark)
                   1504:                                        break;
                   1505:                        }
1.1       cgd      1506:                }
                   1507:                if (flags & MSG_EOR)
                   1508:                        break;
                   1509:                /*
                   1510:                 * If the MSG_WAITALL flag is set (for non-atomic socket),
                   1511:                 * we must not quit until "uio->uio_resid == 0" or an error
                   1512:                 * termination.  If a signal/timeout occurs, return
                   1513:                 * with a short count but without error.
                   1514:                 * Keep sockbuf locked against other readers.
                   1515:                 */
1.144     dyoung   1516:                while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3       andrew   1517:                    !sosendallatonce(so) && !nextrecord) {
1.1       cgd      1518:                        if (so->so_error || so->so_state & SS_CANTRCVMORE)
                   1519:                                break;
1.68      matt     1520:                        /*
                   1521:                         * If we are peeking and the socket receive buffer is
                   1522:                         * full, stop since we can't get more data to peek at.
                   1523:                         */
                   1524:                        if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
                   1525:                                break;
                   1526:                        /*
                   1527:                         * If we've drained the socket buffer, tell the
                   1528:                         * protocol in case it needs to do something to
                   1529:                         * get it filled again.
                   1530:                         */
                   1531:                        if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
                   1532:                                (*pr->pr_usrreq)(so, PRU_RCVD,
1.140     dyoung   1533:                                    NULL, (struct mbuf *)(long)flags, NULL, l);
1.69      thorpej  1534:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
                   1535:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196     dsl      1536:                        if (wakeup_state & SS_RESTARTSYS)
                   1537:                                error = ERESTART;
                   1538:                        else
                   1539:                                error = sbwait(&so->so_rcv);
1.144     dyoung   1540:                        if (error != 0) {
1.1       cgd      1541:                                sbunlock(&so->so_rcv);
1.160     ad       1542:                                sounlock(so);
1.1       cgd      1543:                                splx(s);
1.144     dyoung   1544:                                return 0;
1.1       cgd      1545:                        }
1.21      christos 1546:                        if ((m = so->so_rcv.sb_mb) != NULL)
1.1       cgd      1547:                                nextrecord = m->m_nextpkt;
1.196     dsl      1548:                        wakeup_state = so->so_state;
1.1       cgd      1549:                }
                   1550:        }
1.3       andrew   1551:
1.146     dyoung   1552:        if (m && atomic) {
1.3       andrew   1553:                flags |= MSG_TRUNC;
                   1554:                if ((flags & MSG_PEEK) == 0)
                   1555:                        (void) sbdroprecord(&so->so_rcv);
                   1556:        }
1.1       cgd      1557:        if ((flags & MSG_PEEK) == 0) {
1.144     dyoung   1558:                if (m == NULL) {
1.69      thorpej  1559:                        /*
1.70      thorpej  1560:                         * First part is an inline SB_EMPTY_FIXUP().  Second
1.69      thorpej  1561:                         * part makes sure sb_lastrecord is up-to-date if
                   1562:                         * there is still data in the socket buffer.
                   1563:                         */
1.1       cgd      1564:                        so->so_rcv.sb_mb = nextrecord;
1.69      thorpej  1565:                        if (so->so_rcv.sb_mb == NULL) {
                   1566:                                so->so_rcv.sb_mbtail = NULL;
                   1567:                                so->so_rcv.sb_lastrecord = NULL;
                   1568:                        } else if (nextrecord->m_nextpkt == NULL)
                   1569:                                so->so_rcv.sb_lastrecord = nextrecord;
                   1570:                }
                   1571:                SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
                   1572:                SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1       cgd      1573:                if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.140     dyoung   1574:                        (*pr->pr_usrreq)(so, PRU_RCVD, NULL,
                   1575:                            (struct mbuf *)(long)flags, NULL, l);
1.1       cgd      1576:        }
1.3       andrew   1577:        if (orig_resid == uio->uio_resid && orig_resid &&
                   1578:            (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
                   1579:                sbunlock(&so->so_rcv);
                   1580:                goto restart;
                   1581:        }
1.108     perry    1582:
1.144     dyoung   1583:        if (flagsp != NULL)
1.1       cgd      1584:                *flagsp |= flags;
1.54      lukem    1585:  release:
1.1       cgd      1586:        sbunlock(&so->so_rcv);
1.160     ad       1587:        sounlock(so);
1.1       cgd      1588:        splx(s);
1.144     dyoung   1589:        return error;
1.1       cgd      1590: }
                   1591:
1.14      mycroft  1592: int
1.54      lukem    1593: soshutdown(struct socket *so, int how)
1.1       cgd      1594: {
1.99      matt     1595:        const struct protosw    *pr;
1.160     ad       1596:        int     error;
                   1597:
                   1598:        KASSERT(solocked(so));
1.34      kleink   1599:
1.54      lukem    1600:        pr = so->so_proto;
1.34      kleink   1601:        if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
                   1602:                return (EINVAL);
1.1       cgd      1603:
1.160     ad       1604:        if (how == SHUT_RD || how == SHUT_RDWR) {
1.1       cgd      1605:                sorflush(so);
1.160     ad       1606:                error = 0;
                   1607:        }
1.34      kleink   1608:        if (how == SHUT_WR || how == SHUT_RDWR)
1.160     ad       1609:                error = (*pr->pr_usrreq)(so, PRU_SHUTDOWN, NULL,
1.140     dyoung   1610:                    NULL, NULL, NULL);
1.160     ad       1611:
                   1612:        return error;
1.1       cgd      1613: }
                   1614:
1.195     dsl      1615: void
1.196     dsl      1616: sorestart(struct socket *so)
1.188     ad       1617: {
1.196     dsl      1618:        /*
                   1619:         * An application has called close() on an fd on which another
                   1620:         * of its threads has called a socket system call.
                   1621:         * Mark this and wake everyone up, and code that would block again
                   1622:         * instead returns ERESTART.
                   1623:         * On system call re-entry the fd is validated and EBADF returned.
                   1624:         * Any other fd will block again on the 2nd syscall.
                   1625:         */
1.188     ad       1626:        solock(so);
1.196     dsl      1627:        so->so_state |= SS_RESTARTSYS;
1.188     ad       1628:        cv_broadcast(&so->so_cv);
1.196     dsl      1629:        cv_broadcast(&so->so_snd.sb_cv);
                   1630:        cv_broadcast(&so->so_rcv.sb_cv);
1.188     ad       1631:        sounlock(so);
                   1632: }
                   1633:
1.14      mycroft  1634: void
1.54      lukem    1635: sorflush(struct socket *so)
1.1       cgd      1636: {
1.54      lukem    1637:        struct sockbuf  *sb, asb;
1.99      matt     1638:        const struct protosw    *pr;
1.160     ad       1639:
                   1640:        KASSERT(solocked(so));
1.1       cgd      1641:
1.54      lukem    1642:        sb = &so->so_rcv;
                   1643:        pr = so->so_proto;
1.160     ad       1644:        socantrcvmore(so);
1.1       cgd      1645:        sb->sb_flags |= SB_NOINTR;
1.160     ad       1646:        (void )sblock(sb, M_WAITOK);
1.1       cgd      1647:        sbunlock(sb);
                   1648:        asb = *sb;
1.86      wrstuden 1649:        /*
                   1650:         * Clear most of the sockbuf structure, but leave some of the
                   1651:         * fields valid.
                   1652:         */
                   1653:        memset(&sb->sb_startzero, 0,
                   1654:            sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160     ad       1655:        if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
                   1656:                sounlock(so);
1.1       cgd      1657:                (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160     ad       1658:                solock(so);
                   1659:        }
1.98      christos 1660:        sbrelease(&asb, so);
1.1       cgd      1661: }
                   1662:
1.171     plunky   1663: /*
                   1664:  * internal set SOL_SOCKET options
                   1665:  */
1.142     dyoung   1666: static int
1.171     plunky   1667: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1       cgd      1668: {
1.182     christos 1669:        int error = EINVAL, optval, opt;
1.171     plunky   1670:        struct linger l;
                   1671:        struct timeval tv;
1.142     dyoung   1672:
1.179     christos 1673:        switch ((opt = sopt->sopt_name)) {
1.142     dyoung   1674:
1.170     tls      1675:        case SO_ACCEPTFILTER:
1.177     ad       1676:                error = accept_filt_setopt(so, sopt);
                   1677:                KASSERT(solocked(so));
1.170     tls      1678:                break;
                   1679:
1.171     plunky   1680:        case SO_LINGER:
                   1681:                error = sockopt_get(sopt, &l, sizeof(l));
1.177     ad       1682:                solock(so);
1.171     plunky   1683:                if (error)
1.177     ad       1684:                        break;
1.171     plunky   1685:                if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1.177     ad       1686:                    l.l_linger > (INT_MAX / hz)) {
                   1687:                        error = EDOM;
                   1688:                        break;
                   1689:                }
1.171     plunky   1690:                so->so_linger = l.l_linger;
                   1691:                if (l.l_onoff)
                   1692:                        so->so_options |= SO_LINGER;
                   1693:                else
                   1694:                        so->so_options &= ~SO_LINGER;
1.177     ad       1695:                break;
1.1       cgd      1696:
1.142     dyoung   1697:        case SO_DEBUG:
                   1698:        case SO_KEEPALIVE:
                   1699:        case SO_DONTROUTE:
                   1700:        case SO_USELOOPBACK:
                   1701:        case SO_BROADCAST:
                   1702:        case SO_REUSEADDR:
                   1703:        case SO_REUSEPORT:
                   1704:        case SO_OOBINLINE:
                   1705:        case SO_TIMESTAMP:
1.207     christos 1706:        case SO_NOSIGPIPE:
1.184     christos 1707: #ifdef SO_OTIMESTAMP
                   1708:        case SO_OTIMESTAMP:
                   1709: #endif
1.171     plunky   1710:                error = sockopt_getint(sopt, &optval);
1.177     ad       1711:                solock(so);
1.171     plunky   1712:                if (error)
1.177     ad       1713:                        break;
1.171     plunky   1714:                if (optval)
1.179     christos 1715:                        so->so_options |= opt;
1.142     dyoung   1716:                else
1.179     christos 1717:                        so->so_options &= ~opt;
1.142     dyoung   1718:                break;
                   1719:
                   1720:        case SO_SNDBUF:
                   1721:        case SO_RCVBUF:
                   1722:        case SO_SNDLOWAT:
                   1723:        case SO_RCVLOWAT:
1.171     plunky   1724:                error = sockopt_getint(sopt, &optval);
1.177     ad       1725:                solock(so);
1.171     plunky   1726:                if (error)
1.177     ad       1727:                        break;
1.1       cgd      1728:
1.142     dyoung   1729:                /*
                   1730:                 * Values < 1 make no sense for any of these
                   1731:                 * options, so disallow them.
                   1732:                 */
1.177     ad       1733:                if (optval < 1) {
                   1734:                        error = EINVAL;
                   1735:                        break;
                   1736:                }
1.1       cgd      1737:
1.179     christos 1738:                switch (opt) {
1.171     plunky   1739:                case SO_SNDBUF:
1.177     ad       1740:                        if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
                   1741:                                error = ENOBUFS;
                   1742:                                break;
                   1743:                        }
1.171     plunky   1744:                        so->so_snd.sb_flags &= ~SB_AUTOSIZE;
                   1745:                        break;
1.1       cgd      1746:
                   1747:                case SO_RCVBUF:
1.177     ad       1748:                        if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
                   1749:                                error = ENOBUFS;
                   1750:                                break;
                   1751:                        }
1.171     plunky   1752:                        so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142     dyoung   1753:                        break;
                   1754:
                   1755:                /*
                   1756:                 * Make sure the low-water is never greater than
                   1757:                 * the high-water.
                   1758:                 */
1.1       cgd      1759:                case SO_SNDLOWAT:
1.171     plunky   1760:                        if (optval > so->so_snd.sb_hiwat)
                   1761:                                optval = so->so_snd.sb_hiwat;
                   1762:
                   1763:                        so->so_snd.sb_lowat = optval;
1.142     dyoung   1764:                        break;
1.171     plunky   1765:
1.1       cgd      1766:                case SO_RCVLOWAT:
1.171     plunky   1767:                        if (optval > so->so_rcv.sb_hiwat)
                   1768:                                optval = so->so_rcv.sb_hiwat;
                   1769:
                   1770:                        so->so_rcv.sb_lowat = optval;
1.142     dyoung   1771:                        break;
                   1772:                }
                   1773:                break;
1.28      thorpej  1774:
1.179     christos 1775: #ifdef COMPAT_50
                   1776:        case SO_OSNDTIMEO:
                   1777:        case SO_ORCVTIMEO: {
                   1778:                struct timeval50 otv;
                   1779:                error = sockopt_get(sopt, &otv, sizeof(otv));
1.186     pooka    1780:                if (error) {
                   1781:                        solock(so);
1.183     christos 1782:                        break;
1.186     pooka    1783:                }
1.179     christos 1784:                timeval50_to_timeval(&otv, &tv);
                   1785:                opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182     christos 1786:                error = 0;
1.179     christos 1787:                /*FALLTHROUGH*/
                   1788:        }
                   1789: #endif /* COMPAT_50 */
                   1790:
1.142     dyoung   1791:        case SO_SNDTIMEO:
                   1792:        case SO_RCVTIMEO:
1.182     christos 1793:                if (error)
1.179     christos 1794:                        error = sockopt_get(sopt, &tv, sizeof(tv));
1.177     ad       1795:                solock(so);
1.171     plunky   1796:                if (error)
1.177     ad       1797:                        break;
1.171     plunky   1798:
1.177     ad       1799:                if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
                   1800:                        error = EDOM;
                   1801:                        break;
                   1802:                }
1.28      thorpej  1803:
1.171     plunky   1804:                optval = tv.tv_sec * hz + tv.tv_usec / tick;
                   1805:                if (optval == 0 && tv.tv_usec != 0)
                   1806:                        optval = 1;
1.28      thorpej  1807:
1.179     christos 1808:                switch (opt) {
1.142     dyoung   1809:                case SO_SNDTIMEO:
1.171     plunky   1810:                        so->so_snd.sb_timeo = optval;
1.1       cgd      1811:                        break;
                   1812:                case SO_RCVTIMEO:
1.171     plunky   1813:                        so->so_rcv.sb_timeo = optval;
1.142     dyoung   1814:                        break;
                   1815:                }
                   1816:                break;
1.1       cgd      1817:
1.142     dyoung   1818:        default:
1.177     ad       1819:                solock(so);
                   1820:                error = ENOPROTOOPT;
                   1821:                break;
1.142     dyoung   1822:        }
1.177     ad       1823:        KASSERT(solocked(so));
                   1824:        return error;
1.142     dyoung   1825: }
1.1       cgd      1826:
1.142     dyoung   1827: int
1.171     plunky   1828: sosetopt(struct socket *so, struct sockopt *sopt)
1.142     dyoung   1829: {
                   1830:        int error, prerr;
1.1       cgd      1831:
1.177     ad       1832:        if (sopt->sopt_level == SOL_SOCKET) {
1.171     plunky   1833:                error = sosetopt1(so, sopt);
1.177     ad       1834:                KASSERT(solocked(so));
                   1835:        } else {
1.142     dyoung   1836:                error = ENOPROTOOPT;
1.177     ad       1837:                solock(so);
                   1838:        }
1.1       cgd      1839:
1.142     dyoung   1840:        if ((error == 0 || error == ENOPROTOOPT) &&
                   1841:            so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
                   1842:                /* give the protocol stack a shot */
1.171     plunky   1843:                prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142     dyoung   1844:                if (prerr == 0)
                   1845:                        error = 0;
                   1846:                else if (prerr != ENOPROTOOPT)
                   1847:                        error = prerr;
1.171     plunky   1848:        }
1.160     ad       1849:        sounlock(so);
1.142     dyoung   1850:        return error;
1.1       cgd      1851: }
                   1852:
1.171     plunky   1853: /*
                   1854:  * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
                   1855:  */
                   1856: int
                   1857: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
                   1858:     const void *val, size_t valsize)
                   1859: {
                   1860:        struct sockopt sopt;
                   1861:        int error;
                   1862:
                   1863:        KASSERT(valsize == 0 || val != NULL);
                   1864:
                   1865:        sockopt_init(&sopt, level, name, valsize);
                   1866:        sockopt_set(&sopt, val, valsize);
                   1867:
                   1868:        error = sosetopt(so, &sopt);
                   1869:
                   1870:        sockopt_destroy(&sopt);
                   1871:
                   1872:        return error;
                   1873: }
                   1874:
                   1875: /*
                   1876:  * internal get SOL_SOCKET options
                   1877:  */
                   1878: static int
                   1879: sogetopt1(struct socket *so, struct sockopt *sopt)
                   1880: {
1.179     christos 1881:        int error, optval, opt;
1.171     plunky   1882:        struct linger l;
                   1883:        struct timeval tv;
                   1884:
1.179     christos 1885:        switch ((opt = sopt->sopt_name)) {
1.171     plunky   1886:
                   1887:        case SO_ACCEPTFILTER:
1.177     ad       1888:                error = accept_filt_getopt(so, sopt);
1.171     plunky   1889:                break;
                   1890:
                   1891:        case SO_LINGER:
                   1892:                l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
                   1893:                l.l_linger = so->so_linger;
                   1894:
                   1895:                error = sockopt_set(sopt, &l, sizeof(l));
                   1896:                break;
                   1897:
                   1898:        case SO_USELOOPBACK:
                   1899:        case SO_DONTROUTE:
                   1900:        case SO_DEBUG:
                   1901:        case SO_KEEPALIVE:
                   1902:        case SO_REUSEADDR:
                   1903:        case SO_REUSEPORT:
                   1904:        case SO_BROADCAST:
                   1905:        case SO_OOBINLINE:
                   1906:        case SO_TIMESTAMP:
1.207     christos 1907:        case SO_NOSIGPIPE:
1.184     christos 1908: #ifdef SO_OTIMESTAMP
                   1909:        case SO_OTIMESTAMP:
                   1910: #endif
1.179     christos 1911:                error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171     plunky   1912:                break;
                   1913:
                   1914:        case SO_TYPE:
                   1915:                error = sockopt_setint(sopt, so->so_type);
                   1916:                break;
                   1917:
                   1918:        case SO_ERROR:
                   1919:                error = sockopt_setint(sopt, so->so_error);
                   1920:                so->so_error = 0;
                   1921:                break;
                   1922:
                   1923:        case SO_SNDBUF:
                   1924:                error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
                   1925:                break;
                   1926:
                   1927:        case SO_RCVBUF:
                   1928:                error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
                   1929:                break;
                   1930:
                   1931:        case SO_SNDLOWAT:
                   1932:                error = sockopt_setint(sopt, so->so_snd.sb_lowat);
                   1933:                break;
                   1934:
                   1935:        case SO_RCVLOWAT:
                   1936:                error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
                   1937:                break;
                   1938:
1.179     christos 1939: #ifdef COMPAT_50
                   1940:        case SO_OSNDTIMEO:
                   1941:        case SO_ORCVTIMEO: {
                   1942:                struct timeval50 otv;
                   1943:
                   1944:                optval = (opt == SO_OSNDTIMEO ?
                   1945:                     so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
                   1946:
                   1947:                otv.tv_sec = optval / hz;
                   1948:                otv.tv_usec = (optval % hz) * tick;
                   1949:
                   1950:                error = sockopt_set(sopt, &otv, sizeof(otv));
                   1951:                break;
                   1952:        }
                   1953: #endif /* COMPAT_50 */
                   1954:
1.171     plunky   1955:        case SO_SNDTIMEO:
                   1956:        case SO_RCVTIMEO:
1.179     christos 1957:                optval = (opt == SO_SNDTIMEO ?
1.171     plunky   1958:                     so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
                   1959:
                   1960:                tv.tv_sec = optval / hz;
                   1961:                tv.tv_usec = (optval % hz) * tick;
                   1962:
                   1963:                error = sockopt_set(sopt, &tv, sizeof(tv));
                   1964:                break;
                   1965:
                   1966:        case SO_OVERFLOWED:
                   1967:                error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
                   1968:                break;
                   1969:
                   1970:        default:
                   1971:                error = ENOPROTOOPT;
                   1972:                break;
                   1973:        }
                   1974:
                   1975:        return (error);
                   1976: }
                   1977:
1.14      mycroft  1978: int
1.171     plunky   1979: sogetopt(struct socket *so, struct sockopt *sopt)
1.1       cgd      1980: {
1.160     ad       1981:        int             error;
1.1       cgd      1982:
1.160     ad       1983:        solock(so);
1.171     plunky   1984:        if (sopt->sopt_level != SOL_SOCKET) {
1.1       cgd      1985:                if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160     ad       1986:                        error = ((*so->so_proto->pr_ctloutput)
1.171     plunky   1987:                            (PRCO_GETOPT, so, sopt));
1.1       cgd      1988:                } else
1.160     ad       1989:                        error = (ENOPROTOOPT);
1.1       cgd      1990:        } else {
1.171     plunky   1991:                error = sogetopt1(so, sopt);
                   1992:        }
                   1993:        sounlock(so);
                   1994:        return (error);
                   1995: }
                   1996:
                   1997: /*
                   1998:  * alloc sockopt data buffer buffer
                   1999:  *     - will be released at destroy
                   2000:  */
1.176     plunky   2001: static int
                   2002: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171     plunky   2003: {
                   2004:
                   2005:        KASSERT(sopt->sopt_size == 0);
                   2006:
1.176     plunky   2007:        if (len > sizeof(sopt->sopt_buf)) {
                   2008:                sopt->sopt_data = kmem_zalloc(len, kmflag);
                   2009:                if (sopt->sopt_data == NULL)
                   2010:                        return ENOMEM;
                   2011:        } else
1.171     plunky   2012:                sopt->sopt_data = sopt->sopt_buf;
                   2013:
                   2014:        sopt->sopt_size = len;
1.176     plunky   2015:        return 0;
1.171     plunky   2016: }
                   2017:
                   2018: /*
                   2019:  * initialise sockopt storage
1.176     plunky   2020:  *     - MAY sleep during allocation
1.171     plunky   2021:  */
                   2022: void
                   2023: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
                   2024: {
1.1       cgd      2025:
1.171     plunky   2026:        memset(sopt, 0, sizeof(*sopt));
1.1       cgd      2027:
1.171     plunky   2028:        sopt->sopt_level = level;
                   2029:        sopt->sopt_name = name;
1.176     plunky   2030:        (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171     plunky   2031: }
                   2032:
                   2033: /*
                   2034:  * destroy sockopt storage
                   2035:  *     - will release any held memory references
                   2036:  */
                   2037: void
                   2038: sockopt_destroy(struct sockopt *sopt)
                   2039: {
                   2040:
                   2041:        if (sopt->sopt_data != sopt->sopt_buf)
1.173     plunky   2042:                kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171     plunky   2043:
                   2044:        memset(sopt, 0, sizeof(*sopt));
                   2045: }
                   2046:
                   2047: /*
                   2048:  * set sockopt value
                   2049:  *     - value is copied into sockopt
1.176     plunky   2050:  *     - memory is allocated when necessary, will not sleep
1.171     plunky   2051:  */
                   2052: int
                   2053: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
                   2054: {
1.176     plunky   2055:        int error;
1.171     plunky   2056:
1.176     plunky   2057:        if (sopt->sopt_size == 0) {
                   2058:                error = sockopt_alloc(sopt, len, KM_NOSLEEP);
                   2059:                if (error)
                   2060:                        return error;
                   2061:        }
1.171     plunky   2062:
                   2063:        KASSERT(sopt->sopt_size == len);
                   2064:        memcpy(sopt->sopt_data, buf, len);
                   2065:        return 0;
                   2066: }
                   2067:
                   2068: /*
                   2069:  * common case of set sockopt integer value
                   2070:  */
                   2071: int
                   2072: sockopt_setint(struct sockopt *sopt, int val)
                   2073: {
                   2074:
                   2075:        return sockopt_set(sopt, &val, sizeof(int));
                   2076: }
                   2077:
                   2078: /*
                   2079:  * get sockopt value
                   2080:  *     - correct size must be given
                   2081:  */
                   2082: int
                   2083: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
                   2084: {
1.170     tls      2085:
1.171     plunky   2086:        if (sopt->sopt_size != len)
                   2087:                return EINVAL;
1.1       cgd      2088:
1.171     plunky   2089:        memcpy(buf, sopt->sopt_data, len);
                   2090:        return 0;
                   2091: }
1.1       cgd      2092:
1.171     plunky   2093: /*
                   2094:  * common case of get sockopt integer value
                   2095:  */
                   2096: int
                   2097: sockopt_getint(const struct sockopt *sopt, int *valp)
                   2098: {
1.1       cgd      2099:
1.171     plunky   2100:        return sockopt_get(sopt, valp, sizeof(int));
                   2101: }
1.1       cgd      2102:
1.171     plunky   2103: /*
                   2104:  * set sockopt value from mbuf
                   2105:  *     - ONLY for legacy code
                   2106:  *     - mbuf is released by sockopt
1.176     plunky   2107:  *     - will not sleep
1.171     plunky   2108:  */
                   2109: int
                   2110: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
                   2111: {
                   2112:        size_t len;
1.176     plunky   2113:        int error;
1.1       cgd      2114:
1.171     plunky   2115:        len = m_length(m);
1.1       cgd      2116:
1.176     plunky   2117:        if (sopt->sopt_size == 0) {
                   2118:                error = sockopt_alloc(sopt, len, KM_NOSLEEP);
                   2119:                if (error)
                   2120:                        return error;
                   2121:        }
1.1       cgd      2122:
1.171     plunky   2123:        KASSERT(sopt->sopt_size == len);
                   2124:        m_copydata(m, 0, len, sopt->sopt_data);
                   2125:        m_freem(m);
1.1       cgd      2126:
1.171     plunky   2127:        return 0;
                   2128: }
1.1       cgd      2129:
1.171     plunky   2130: /*
                   2131:  * get sockopt value into mbuf
                   2132:  *     - ONLY for legacy code
                   2133:  *     - mbuf to be released by the caller
1.176     plunky   2134:  *     - will not sleep
1.171     plunky   2135:  */
                   2136: struct mbuf *
                   2137: sockopt_getmbuf(const struct sockopt *sopt)
                   2138: {
                   2139:        struct mbuf *m;
1.107     darrenr  2140:
1.176     plunky   2141:        if (sopt->sopt_size > MCLBYTES)
                   2142:                return NULL;
                   2143:
                   2144:        m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171     plunky   2145:        if (m == NULL)
                   2146:                return NULL;
                   2147:
1.176     plunky   2148:        if (sopt->sopt_size > MLEN) {
                   2149:                MCLGET(m, M_DONTWAIT);
                   2150:                if ((m->m_flags & M_EXT) == 0) {
                   2151:                        m_free(m);
                   2152:                        return NULL;
                   2153:                }
1.1       cgd      2154:        }
1.176     plunky   2155:
                   2156:        memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
                   2157:        m->m_len = sopt->sopt_size;
1.160     ad       2158:
1.171     plunky   2159:        return m;
1.1       cgd      2160: }
                   2161:
1.14      mycroft  2162: void
1.54      lukem    2163: sohasoutofband(struct socket *so)
1.1       cgd      2164: {
1.153     rmind    2165:
1.90      christos 2166:        fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189     ad       2167:        selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1       cgd      2168: }
1.72      jdolecek 2169:
                   2170: static void
                   2171: filt_sordetach(struct knote *kn)
                   2172: {
                   2173:        struct socket   *so;
                   2174:
1.155     ad       2175:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2176:        solock(so);
1.73      christos 2177:        SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
                   2178:        if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72      jdolecek 2179:                so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160     ad       2180:        sounlock(so);
1.72      jdolecek 2181: }
                   2182:
                   2183: /*ARGSUSED*/
                   2184: static int
1.129     yamt     2185: filt_soread(struct knote *kn, long hint)
1.72      jdolecek 2186: {
                   2187:        struct socket   *so;
1.160     ad       2188:        int rv;
1.72      jdolecek 2189:
1.155     ad       2190:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2191:        if (hint != NOTE_SUBMIT)
                   2192:                solock(so);
1.72      jdolecek 2193:        kn->kn_data = so->so_rcv.sb_cc;
                   2194:        if (so->so_state & SS_CANTRCVMORE) {
1.108     perry    2195:                kn->kn_flags |= EV_EOF;
1.72      jdolecek 2196:                kn->kn_fflags = so->so_error;
1.160     ad       2197:                rv = 1;
                   2198:        } else if (so->so_error)        /* temporary udp error */
                   2199:                rv = 1;
                   2200:        else if (kn->kn_sfflags & NOTE_LOWAT)
                   2201:                rv = (kn->kn_data >= kn->kn_sdata);
                   2202:        else
                   2203:                rv = (kn->kn_data >= so->so_rcv.sb_lowat);
                   2204:        if (hint != NOTE_SUBMIT)
                   2205:                sounlock(so);
                   2206:        return rv;
1.72      jdolecek 2207: }
                   2208:
                   2209: static void
                   2210: filt_sowdetach(struct knote *kn)
                   2211: {
                   2212:        struct socket   *so;
                   2213:
1.155     ad       2214:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2215:        solock(so);
1.73      christos 2216:        SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
                   2217:        if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72      jdolecek 2218:                so->so_snd.sb_flags &= ~SB_KNOTE;
1.160     ad       2219:        sounlock(so);
1.72      jdolecek 2220: }
                   2221:
                   2222: /*ARGSUSED*/
                   2223: static int
1.129     yamt     2224: filt_sowrite(struct knote *kn, long hint)
1.72      jdolecek 2225: {
                   2226:        struct socket   *so;
1.160     ad       2227:        int rv;
1.72      jdolecek 2228:
1.155     ad       2229:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2230:        if (hint != NOTE_SUBMIT)
                   2231:                solock(so);
1.72      jdolecek 2232:        kn->kn_data = sbspace(&so->so_snd);
                   2233:        if (so->so_state & SS_CANTSENDMORE) {
1.108     perry    2234:                kn->kn_flags |= EV_EOF;
1.72      jdolecek 2235:                kn->kn_fflags = so->so_error;
1.160     ad       2236:                rv = 1;
                   2237:        } else if (so->so_error)        /* temporary udp error */
                   2238:                rv = 1;
                   2239:        else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72      jdolecek 2240:            (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160     ad       2241:                rv = 0;
                   2242:        else if (kn->kn_sfflags & NOTE_LOWAT)
                   2243:                rv = (kn->kn_data >= kn->kn_sdata);
                   2244:        else
                   2245:                rv = (kn->kn_data >= so->so_snd.sb_lowat);
                   2246:        if (hint != NOTE_SUBMIT)
                   2247:                sounlock(so);
                   2248:        return rv;
1.72      jdolecek 2249: }
                   2250:
                   2251: /*ARGSUSED*/
                   2252: static int
1.129     yamt     2253: filt_solisten(struct knote *kn, long hint)
1.72      jdolecek 2254: {
                   2255:        struct socket   *so;
1.160     ad       2256:        int rv;
1.72      jdolecek 2257:
1.155     ad       2258:        so = ((file_t *)kn->kn_obj)->f_data;
1.72      jdolecek 2259:
                   2260:        /*
                   2261:         * Set kn_data to number of incoming connections, not
                   2262:         * counting partial (incomplete) connections.
1.108     perry    2263:         */
1.160     ad       2264:        if (hint != NOTE_SUBMIT)
                   2265:                solock(so);
1.72      jdolecek 2266:        kn->kn_data = so->so_qlen;
1.160     ad       2267:        rv = (kn->kn_data > 0);
                   2268:        if (hint != NOTE_SUBMIT)
                   2269:                sounlock(so);
                   2270:        return rv;
1.72      jdolecek 2271: }
                   2272:
                   2273: static const struct filterops solisten_filtops =
                   2274:        { 1, NULL, filt_sordetach, filt_solisten };
                   2275: static const struct filterops soread_filtops =
                   2276:        { 1, NULL, filt_sordetach, filt_soread };
                   2277: static const struct filterops sowrite_filtops =
                   2278:        { 1, NULL, filt_sowdetach, filt_sowrite };
                   2279:
                   2280: int
1.129     yamt     2281: soo_kqfilter(struct file *fp, struct knote *kn)
1.72      jdolecek 2282: {
                   2283:        struct socket   *so;
                   2284:        struct sockbuf  *sb;
                   2285:
1.155     ad       2286:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2287:        solock(so);
1.72      jdolecek 2288:        switch (kn->kn_filter) {
                   2289:        case EVFILT_READ:
                   2290:                if (so->so_options & SO_ACCEPTCONN)
                   2291:                        kn->kn_fop = &solisten_filtops;
                   2292:                else
                   2293:                        kn->kn_fop = &soread_filtops;
                   2294:                sb = &so->so_rcv;
                   2295:                break;
                   2296:        case EVFILT_WRITE:
                   2297:                kn->kn_fop = &sowrite_filtops;
                   2298:                sb = &so->so_snd;
                   2299:                break;
                   2300:        default:
1.160     ad       2301:                sounlock(so);
1.149     pooka    2302:                return (EINVAL);
1.72      jdolecek 2303:        }
1.73      christos 2304:        SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72      jdolecek 2305:        sb->sb_flags |= SB_KNOTE;
1.160     ad       2306:        sounlock(so);
1.72      jdolecek 2307:        return (0);
                   2308: }
                   2309:
1.154     ad       2310: static int
                   2311: sodopoll(struct socket *so, int events)
                   2312: {
                   2313:        int revents;
                   2314:
                   2315:        revents = 0;
                   2316:
                   2317:        if (events & (POLLIN | POLLRDNORM))
                   2318:                if (soreadable(so))
                   2319:                        revents |= events & (POLLIN | POLLRDNORM);
                   2320:
                   2321:        if (events & (POLLOUT | POLLWRNORM))
                   2322:                if (sowritable(so))
                   2323:                        revents |= events & (POLLOUT | POLLWRNORM);
                   2324:
                   2325:        if (events & (POLLPRI | POLLRDBAND))
                   2326:                if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
                   2327:                        revents |= events & (POLLPRI | POLLRDBAND);
                   2328:
                   2329:        return revents;
                   2330: }
                   2331:
                   2332: int
                   2333: sopoll(struct socket *so, int events)
                   2334: {
                   2335:        int revents = 0;
                   2336:
1.160     ad       2337: #ifndef DIAGNOSTIC
                   2338:        /*
                   2339:         * Do a quick, unlocked check in expectation that the socket
                   2340:         * will be ready for I/O.  Don't do this check if DIAGNOSTIC,
                   2341:         * as the solocked() assertions will fail.
                   2342:         */
1.154     ad       2343:        if ((revents = sodopoll(so, events)) != 0)
                   2344:                return revents;
1.160     ad       2345: #endif
1.154     ad       2346:
1.160     ad       2347:        solock(so);
1.154     ad       2348:        if ((revents = sodopoll(so, events)) == 0) {
                   2349:                if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
                   2350:                        selrecord(curlwp, &so->so_rcv.sb_sel);
1.160     ad       2351:                        so->so_rcv.sb_flags |= SB_NOTIFY;
1.154     ad       2352:                }
                   2353:
                   2354:                if (events & (POLLOUT | POLLWRNORM)) {
                   2355:                        selrecord(curlwp, &so->so_snd.sb_sel);
1.160     ad       2356:                        so->so_snd.sb_flags |= SB_NOTIFY;
1.154     ad       2357:                }
                   2358:        }
1.160     ad       2359:        sounlock(so);
1.154     ad       2360:
                   2361:        return revents;
                   2362: }
                   2363:
                   2364:
1.94      yamt     2365: #include <sys/sysctl.h>
                   2366:
                   2367: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
                   2368:
                   2369: /*
                   2370:  * sysctl helper routine for kern.somaxkva.  ensures that the given
                   2371:  * value is not too small.
                   2372:  * (XXX should we maybe make sure it's not too large as well?)
                   2373:  */
                   2374: static int
                   2375: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
                   2376: {
                   2377:        int error, new_somaxkva;
                   2378:        struct sysctlnode node;
                   2379:
                   2380:        new_somaxkva = somaxkva;
                   2381:        node = *rnode;
                   2382:        node.sysctl_data = &new_somaxkva;
                   2383:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2384:        if (error || newp == NULL)
                   2385:                return (error);
                   2386:
                   2387:        if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
                   2388:                return (EINVAL);
                   2389:
1.136     ad       2390:        mutex_enter(&so_pendfree_lock);
1.94      yamt     2391:        somaxkva = new_somaxkva;
1.136     ad       2392:        cv_broadcast(&socurkva_cv);
                   2393:        mutex_exit(&so_pendfree_lock);
1.94      yamt     2394:
                   2395:        return (error);
                   2396: }
                   2397:
1.178     pooka    2398: static void
1.187     cegger   2399: sysctl_kern_somaxkva_setup(void)
1.94      yamt     2400: {
                   2401:
1.178     pooka    2402:        KASSERT(socket_sysctllog == NULL);
                   2403:        sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97      atatat   2404:                       CTLFLAG_PERMANENT,
                   2405:                       CTLTYPE_NODE, "kern", NULL,
                   2406:                       NULL, 0, NULL, 0,
                   2407:                       CTL_KERN, CTL_EOL);
                   2408:
1.178     pooka    2409:        sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97      atatat   2410:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103     atatat   2411:                       CTLTYPE_INT, "somaxkva",
                   2412:                       SYSCTL_DESCR("Maximum amount of kernel memory to be "
                   2413:                                    "used for socket buffers"),
1.94      yamt     2414:                       sysctl_kern_somaxkva, 0, NULL, 0,
                   2415:                       CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
                   2416: }

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